The Duke And Duchess of Cambridge Undertake Engagements Celebrating The Commonwealth in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge wrapped up her baby bump in a cream coat by Goat,  attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

The Duchess of Cambridge in a cream coat by Goat and carried her favourite Mulberry clutch, visit to SportsAid to undertake engagements celebrating the Commonwealth

Catherine, Duchess of Cambridge is completing a day of engagements celebrating the Commonwealth before stepping out of the spotlight

Catherine, Duchess of Cambridge wrapped up her baby bump in a cream coat by Goat and carried her favorite Mulberry clutch attends a SportsAid event at the Copper Box Arena in London, England.

Catherine, Duchess of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England

Catherine, Duchess of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England

The Duchess of Cambridge added a touch of color to her ensemble with a patterned floral top from Hobbs, as she arrived at the Olympic Park in London.

Catherine, Duchess of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

The pregnant Duchess of Cambridge looked in great spirits ahead of taking time out to have her third baby, arrives at a SportsAid event in Queen Elizabeth Olympic Park in London, England

Catherine, Duchess of Cambridge wrapped up her baby bump in a cream coat by Goat and carried her favorite Mulberry clutch. She added a touch of color to her ensemble with a patterned floral top from Hobbs, visit to SportsAid to undertake engagements celebrating the Commonwealth.

The Duchess of Cambridge accessorized with her favorite Annoushka Baroque Pearl Drop earrings, as she visit to SportsAid to undertake engagements celebrating the Commonwealth.

Catherine, Duchess of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England

The pregnant Duchess of Cambridge looked in great spirits ahead of taking time out to have her third baby, arrives at a SportsAid event in Queen Elizabeth Olympic Park in London, England

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit SportsAid to undertake engagements celebrating the Commonwealth at the Copperbox Arena on March 22, 2018 in London, England.

Pregnant Catherine, Duchess of Cambridge slipped into black skinny jeans and teamed with a pair of towering suede heels for her last day of royal engagements before giving birth to her third child.

Catherine, Duchess of Cambridge opted for a smart casual look for her outings today in skinny jeans, teamed with a non-maternity top from Hobbs and a cream coat by Goat, teamed with a pair of towering suede heels, arrives at SportsAid to undertake engagements celebrating the Commonwealth.

The Duchess of Cambridge wearing Goat Redgrave coat with a patterned floral top from Hobbs and carried her favorite Mulberry clutch for her visit to East London

Catherine, Duchess of Cambridge (skinny jeans and towering suede shoe detail) attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

Pregnant Catherine, Duchess of Cambridge slipped into black skinny jeans, a coat by Goat and teamed with a pair of towering suede heels for her last day of royal engagements before giving birth to her third child.

Prince William, Duke of Cambridge attends a SportsAid event at the Copper Box Arena in Queen Elizabeth Olympic Park on March 22, 2018 in London, England.

Pregnant Catherine, Duchess of Cambridge slipped into black skinny jeans, a cream coat by Goat and teamed with a pair of towering suede heels for her last day of royal engagements before giving birth

Prince William, Duke of Cambridge will take part in a Commonwealth quiz, alongside athletes and coaches, as he visit to SportsAid to undertake engagements celebrating the Commonwealth.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge, who are soon to be parents for the third time, looked in great spirits as they arrived for their last joint engagement before Kate gives birth

Prince William received a  coaching session from wheelchair basketball players, some of whom hope to compete in the 2022 Commonwealth Games in Birmingham

Catherine, Duchess of Cambridge joked with her husband Prince William, Duke of Cambridge as he prepared to take part in a game of wheelchair basketball

Catherine, Duchess of Cambridge (left) took part in a Commonwealth Quiz in which athletes, coaches and supporters were questioned on their knowledge of the Commonwealth

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge were welcome by a group of youngsters from a local school turned out in force to welcome the royal visitors

The Duke of Cambridge couldn't hide his delight as he had the chance to take part in a game of wheelchair basketball

Catherine, Duchess of Cambridge look chic in a collarless Goat Redgrave coat, she added a touch of color to her ensemble with a patterned floral top from Hobbs, slipped into black skinny jeans, teamed with a pair of towering suede heels and carried a Mulberry clutch, she accessorized with Annoushka Baroque Pearl drop earrings, as she visit to East London, before maternity leave.

The Duchess of Cambridge glowing in a cream coat, which is by Goat with a patterned floral top from Hobbs, she accessorized with her favorite Annoushka Baroque Pearl Drop earrings, as she arrived for her last engagement before she gives birth to their third child.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge looked delighted to be working together today on Kate's last engagement before she takes time off to have her baby.

The Duke and Duchess of Cambridge shared a joke as they  chatted to athletes aspiring to take part in the next Commonwealth Games

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge share a joke as they met wheelchair basketball players at the Copperbox Arena in East London.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge both donned aprons and got stuck into preparations for the Commonwealth Big Lunch, which encourages people to get together for food with members of their local community

The Duchess of Cambridge chatted to pupils from Chobham Academy, East London as she arrived at the Olympic Park

Pregnant Catherine, Duchess of Cambridge is due for a well earned rest once today's engagements are complete. It's not likely she will be seen in public again before she emerges from hospital with her newborn, pictured as she visit SportsAid to undertake engagements celebrating the Commonwealth in London.

The Duchess of Cambridge first stop of the day is a visit to SportsAid to undertake engagements celebrating the Commonwealth. The Duchess wrapped up her baby bump in a cream coat by Goat, and carried her favourite Mulberry clutch

Pregnant Catherine, Duchess of Cambridge paused to boys from Chobham Academy who took pride of place in the front row

The Duchess of Cambridge showed off her blossoming baby bump in a black floral top from Hobbs and cream coat by Goat arrives at Copperbox Arena in East London

The Duke and The Duchess of Cambridge seemed very impressed by youngsters' artwork as they gave the royals a warm welcome as they arrived at the Olympic Park in London.

The Duke and Duchess of Cambridge paused to examine the artwork created by young school children for the royal visit

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge chatted with a group of youngsters from a local school turned out in force to welcome the royal visitors

The Duchess of Cambridge was wearing her Goat coat and a patterned floral top from Hobbs for her visit to East London today. She's spending her last day before maternity leave undertaking events celebrating the Commonwealth

Prince Willia, Duke of Cambridge was eager to get involved in the game as he met with wheelchair basketball players at the Copperbox Arena , as  his wife Catherine, Duchess of Cambridge looks on.

Catherine, Duchess of Cambridge visit SportsAid to undertake engagements celebrating the Commonwealth at the Copperbox Arena on March 22, 2018 in London, England.

Pregnant Catherine, Duchess of Cambridge was looking a little windswept as she brushed her brunette locks out of her face

The Duchess of Cambridge brushed her brunette locks out of her face, as she arrives at SportsAid to undertake engagements celebrating the Commonwealth at the Copperbox Arena on March 22, 2018 in London, England.

The Duchess of Cambridge spending her last day before maternity leave undertaking events celebrating the Commonwealth, was looking a little windswept as she brushed her brunette locks out of her face.

Catherine, Duchess of Cambridge take part in a Commonwealth Quiz in which athletes, coaches and supporters are questioned on their knowledge of the Commonwealth, during their visit to the Copperbox Arena on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge was in cheerful spirits as she took part in a Commonwealth Quiz in which athletes, coaches and supporters are questioned on their knowledge of the Commonwealth, during their visit to the Copperbox Arena on March 22, 2018 in London, England.

The Duchess of Cambridge glowing in a cream coat, which is by Goat and a patterned floral top from Hobbs, she accessorized with her favorite Annoushka Baroque Pearl Drop earrings, as she arrived for her last engagement before she gives birth to their third child.

Catherine, Duchess of Cambridge take part in a Commonwealth Quiz in which athletes, coaches and supporters are questioned on their knowledge of the Commonwealth, during their visit to the Copperbox Arena on March 22, 2018 in London, England.

The Duchess of Cambridge looked elegant in a cream coat by Goat, teamed with a patterned floral top from Hobbs, she accessorized with Annoushka Baroque Pearl Drop earrings for her visit to East London, spending her last day before maternity leave undertaking events celebrating the Commonwealth

Prince William joined coaches, athletes and supporters for a quiz about the Commonwealth

The Duchess of Cambridge was seen chatting to soprano Laura Wright (second from right) and the SportsAid event

Catherine, Duchess of Cambridge meet wheelchair basketball players, some of whom hope to compete in the 2022 Commonwealth Games in Birmingham, during their visit to the Copperbox Arena on March 22, 2018 in London, England.

The Duchess of Cambridge wrapped up her baby bump in a cream coat by Goat, and carried her favorite Mulberry clutch visit to SportsAid to undertake engagements celebrating the Commonwealth.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, who was overheard chatting to schoolchildren about their favorite subjects and admitted he was 'very bad at maths' in his younger years

Mother-to-be The Duchess of Cambridge looked animated as she paused to chat to a young member of the welcoming committee outside the arena

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit SportsAid to undertake engagements celebrating the Commonwealth at the Copperbox Arena on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge, who looked impressed as he chatted to schoolchildren who were waving the flags of Commonwealth nations to greet the royal visitors

Prince William and Kate Middleton met with wheelchair basketball players who are hoping to compete at the next Commonwealth Games

Catherine, Duchess of Cambridge wearing Goat Redgrave coat on a visit to Child Bereavement UK in March 2013 while pregnant with Prince George

Catherine, Duchess of Cambridge sported cream coat by Goat on a engagement at Hornsey Road Children's Centre in November 2017

Pregnant Catherine, Duchess of Cambridge, attend a SportsAid event at the Copper Box in the Olympic Park. The national charity helps young British people aspiring to be the country's next Olympic, Paralympic, Commonwealth and world champions

Prince William, Duke of Cambridge chatting to youngsters outside the event, and admitted he was bad at maths at school but loved geography

Prince William looked like he was in his element as he had the chance to take part in a game of wheelchair basketball

Pregnant Catherine, Duchess of Cambridge looked in great spirits as she chatted to SportsAid coaches, athletes and volunteers

The Duchess of Cambridge looked elegant in a cream coat by Goat, added an ensemble with a patterned floral top from Hobbs for her visit to East London today. She's spending her last day before maternity leave undertaking events celebrating the Commonwealth

(R) The Duke and Duchess of Cambridge arrive to watch wheelchair basketball during a SportsAid event at the Copper Box in the Olympic Park, London.

Catherine, Duchess of Cambridge spent some time chatting to schoolchildren about the flags they had made for the royal visit

The Duchess of Cambridge Look chic in a collarless coat by Goat, donned a patterned floral top from Hobbs, she accessorized with her favorite Annoushka Baroque Pearl Drop earrings and carried Mulberry clutch, spending her last day before maternity leave undertaking events celebrating the Commonwealth.

Rather than sitting on the sidelines, Prince William was eager to get involved in the game

The Duchess of Cambridge showed off her blossoming baby bump in a black floral top and cream coat

Prince William, Duke of Cambridge with pregnant wife Catherine, Duchess of Cambridge, who was seen bonding with youngsters during her last official engagement before giving birth again

Catherine, Duchess of Cambridge visit SportsAid to undertake engagements celebrating the Commonwealth at the Copperbox Arena on March 22, 2018 in London, England.

The pregnant Duchess of Cambridge looked in great spirits ahead of taking time out to have her third baby. She is completing a day of engagements celebrating the Commonwealth before stepping out of the spotlight

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet wheelchair basketball players, some of whom hope to compete in the 2022 Commonwealth Games in Birmingham, during their visit to the Copperbox Arena on March 22, 2018 in London, England.

Prince William looked like he was in his element as he had the chance to take part in a game of wheelchair basketball

The Duke and Duchess of Cambridge were delighted to be spending time with wheelchair basketball players who are hoping to compete in the 2022

(L) Catherine, Duchess of Cambridge took part in a quiz about the Commonwealth, although The Duchess didn't get all of the questions right

Catherine, Duchess of Cambridge donned her apron to help out in the kitchen at St Luke’s Community Center

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge take part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

The Duchess of Cambridge tied her apron securely at the front, which highlighted her bump, as she got stuck in at the kitchen for the cook-off at St Luke’s Community Center in London.

Catherine, Duchess of Cambridge takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

(R) Catherine, Duchess of Cambridge takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge take part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.

Catherine, Duchess of Cambridge takes part in preparations for a Commonwealth Big Lunch at St Luke's Community Centre on March 22, 2018 in London, England.