Crown Prince Family of Japan Visits Suzaki Imperial Villa on August 16, 2018 in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko are seen at Mitsuihama Beach as they visit the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko are seen at Mitsuihama Beach as they visit the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko are seen at Mitsuihama Beach as they visit the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko greet well-wishers on arrival at Shimoda Station on the way to the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko greet well-wishers on arrival at Shimoda Station on the way to the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko greet well-wishers on arrival at Shimoda Station on the way to the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko greet well-wishers on arrival at Shimoda Station on the way to the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko greet well-wishers on arrival at Shimoda Station on the way to the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince Naruhito, Crown Princess Masako, and Princess Aiko greet well-wishers on arrival at Shimoda Station on the way to the Suzaki Imperial Villa on August 16, 2018, in Shimoda, Shizuoka, Japan.

Crown Prince of Japan's Family Visits Nasu Imperial Villa on August 21, 2017 in Nasushiobara, Tochigi, Japan.

(L to R) Crown Prince Naruhito with wife Crown Princess Masako and their daughter Princess Aiko wave to well-wishers on arrival at JR Nasushiobara Station on the way to the Nasu Imperial Villa on August 21, 2017 in Nasushiobara, Tochigi, Japan. 

(L to R) Crown Prince Naruhito with wife Crown Princess Masako and their daughter Princess Aiko of Japan wave to well-wishers on arrival at JR Nasushiobara Station on the way to the Nasu Imperial Villa on August 21, 2017 in Nasushiobara, Tochigi, Japan.

(L to R) Crown Princess Masako with daughter Princess Aiko of Japan wave to well-wishers on arrival at JR Nasushiobara Station on the way to the Nasu Imperial Villa on August 21, 2017 in Nasushiobara, Tochigi, Japan.

Princess Aiko of Japan wave to well-wishers on arrival at JR Nasushiobara Station on the way to the Nasu Imperial Villa on August 21, 2017 in Nasushiobara, Tochigi, Japan.

Crown Prince Naruhito with wife Crown Princess Masako of Japan wave to well-wishers on arrival at JR Nasushiobara Station on the way to the Nasu Imperial Villa on August 21, 2017 in Nasushiobara, Tochigi, Japan.

Princess Aiko of Japan graduates from junior high school on March 22, 2017.

Princess Aiko (C), flanked by her parents Crown Prince Naruhito (L) and Crown Princess Masako, poses at the gate of Gakushuin Girls' Junior High School in Tokyo before her graduation ceremony on March 22, 2017. 

Princess Aiko (C), flanked by her parents Crown Prince Naruhito (L) and Crown Princess Masako, speaks to reporters at the gate of Gakushuin Girls' Junior High School in Tokyo before her graduation ceremony on March 22, 2017. The princess said, 'I made many good friends and enjoyed the (past) three years.' 

Princess Aiko (C), flanked by her parents Crown Prince Naruhito (L) and Crown Princess Masako, poses at the gate of Gakushuin Girls' Junior High School in Tokyo before her graduation ceremony on March 22, 2017. 

Crown Prince Family of Japan attend a symposium on water on August 1, 2016 in Tokyo, Japan.

Japanese Crown Prince Naruhito and Crown Princess Masako attend a symposium on water on August 1, 2016 in Tokyo, Japan.

(L-R) Crown Prince Naruhito, Crown Princess Masako and Princess Aiko attend a symposium on water on August 1, 2016 in Tokyo, Japan.

(L-R) Crown Prince Naruhito, Crown Princess Masako and Princess Aiko of Japan attend a symposium on water on August 1, 2016 in Tokyo, Japan.

Crown Prince Naruhito addresses during a symposium on water on August 1, 2016 in Tokyo, Japan.

(R-L) Crown Prince Naruhito, Crown Princess Masako and Princess Aiko attend a symposium on water on August 1, 2016 in Tokyo, Japan.

Crown Prince Naruhito and Crown Princess Masako of Japan attend a symposium on water on August 1, 2016 in Tokyo, Japan.

Crown Princess Masako and Princess Aiko of Japan attend a symposium on water on August 1, 2016 in Tokyo, Japan.

Crown Prince Family Visit Nara And Kyoto - Day 1 on July 21, 2016

Crown Prince Naruhito and Crown Princess Masako wave to well-wishers on arrival at Kashihara Jingu Station to visit the the mausoleum of Emperor Jimmu on July 21, 2016 in Kashihara, Nara, Japan. They visit the grave of the first emperor of Japan, to mark the 2,600th anniversary of his death. According to Japanese legendary Kojiki and Nihon Shoki, Emperor Jinmu died 585 BC. 

(L to R) Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Aiko wave to well-wishers on arrival at Kashihara Jingu Station to visit the the mausoleum of Emperor Jimmu on July 21, 2016 in Kashihara, Nara, Japan. 

(L to R) Princess Aiko and Crown Princess Masako wave to well-wishers on arrival at Kashihara Jingu Station after visiting the the mausoleum of Emperor Jimmu on July 21, 2016 in Kashihara, Nara, Japan.

Crown Prince Family Visit Botticelli Exhibition at the Tokyo Metropolitan Art Museum on March 14, 2016 in Tokyo, Japan.

Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Aiko visit the 'Botticelli and His Time' exhibition at the Tokyo Metropolitan Art Museum on March 14, 2016 in Tokyo, Japan.

Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Aiko visit the 'Botticelli and His Time' exhibition at the Tokyo Metropolitan Art Museum on March 14, 2016 in Tokyo, Japan.

Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Aiko visit the 'Botticelli and His Time' exhibition at the Tokyo Metropolitan Art Museum on March 14, 2016 in Tokyo, Japan.

Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Aiko visit the 'Botticelli and His Time' exhibition at the Tokyo Metropolitan Art Museum on March 14, 2016 in Tokyo, Japan.

Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Aiko visit the 'Botticelli and His Time' exhibition at the Tokyo Metropolitan Art Museum on March 14, 2016 in Tokyo, Japan.

Crown Princess Masako of Japan turns 52 today, December 9, 2015

HIH Crown Princess Masako turned 52 years old today December 9th.

Crown Princess Masako of Japan with their royal dog named “Yuri”

(C) Crown Princess Masako celebrates her birthday with her husband Crown Prince Naruhito of Japan and their daughter Princess Aiko

(L-R) Crown Prince Naruhito, Crown Princess Masako, their daughter Princess Aiko and their royal dog Yuri