Catherine, Duchess Of Cambridge Attends The Anna Freud National Centre Gala Dinner at Kensington Palace on November 7, 2017 in London, England.

Catherine, Duchess of Cambridge speaks to Peter Fonagy at the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF) at Kensington Palace on November 7, 2017 in London, England.

Catherine, Duchess of Cambridge in her Diane Von Furstenberg dress at a charity gala dinner at Kensington Palace in honour of The Anna Freud Center

Pregnant Catherine, Duchess of Cambridge wore her brunette locks in bouncy curls and accessorized her dress with a pair of delicate sparkly earrings, as she arrives at the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF) at Kensington Palace on November 7, 2017 in London, England.

(L) The Duchess of Cambridge looked elegant in a floor-length Diane Von Furstenberg frock speaks to guests as she attended the 2017 charity gala dinner at Kensington Palace in honour of The Anna Freud Center

Britain's Catherine, Duchess of Cambridge speaks to guests as she attends a charity 2017 Gala Dinner at Kensington Palace in honor of The Anna Freud Center

Britain's Catherine, Duchess of Cambridge accessorized with a pair of glittering teardrop earrings, pictured, and wore a poppy pin, during a charity 2017 gala dinner at Kensington Palace in honor of The Anna Freud Centre

Pregnant Catherine, Duchess of Cambridge who is expecting her third child with Prince William in April 2018, displayed just the hint of a bump in the black designer frock as she attends a glittering Kensington Palace 2017 charity gala dinner.

Catherine, Duchess of Cambridge speaks to Peter Fonagy at the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF) at Kensington Palace on November 7, 2017 in London, England.

Britain's Catherine, Duchess of Cambridge displayed the hint of a baby bump in a black lace Diane Von Furstenberg frock at a charity 2017 gala dinner at Kensington Palace in honor of The Anna Freud Center

Catherine, Duchess of Cambridge, speaks to Peter Fonagy, CEO of the Anna Freud Centre at the 2017 Gala Dinner event at Kensington Palace in honor of The Anna Freud Center

Radiant Catherine, Duchess of Cambridge in her favorite ensembles, wore the £785 Diane Von Furstenberg Zarita lace gown, she accessorized with a pair of glittering teardrop earrings, an eye-catching chunky bracelet and carried a black satin clutch, attended a charity 2017 gala dinner at Kensington Palace in honor of The Anna Freud Center

Catherine, Duchess of Cambridge laughed as she shared a joke with Mr Fonagy (R) during the reception at Kensington Palace

Catherine, Duchess of Cambridge showed off her growing baby bump in a floor length Diane Von Furstenberg Zarita lace black gown at the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families.

Britain's Catherine, Duchess of Cambridge speaks to Peter Fonagy, CEO of the Anna Freud Center at the 2017 Gala Dinner for The Anna Freud National Centre for Children and Families (AFNCCF), at Kensington Palace in London on November 7, 2017.

Catherine, Duchess of Cambridge also wore the elegant £785 Diane Von Furstenberg Zarita lace floor-sweeping gown while pregnant with Princess Charlotte in 2014, pictured.

Catherine, Duchess of Cambridge in a floor length Diane Von Furstenberg Zarita black lace gown featuring a fitted bodice and fluted skirt, three-quarter length sleeves combined with the scalloped neckline, the all-over lace design gives it a romantic feel, as she attends a glittering Kensington Palace 2017 charity gala. The Duchess of Cambridge wore it back in 2014 to the Royal Variety Performance when she pregnant with Princess Charlotte, pictured on right.