Sweet detail on Princess Charlotte's backpack you might of missed

Princess Charlotte is finally off to school!

The royal tot joined big brother Prince George on Thursday morning for her first day of school at Thomas's Battersea in London. Escorted by Duchess Kate and Prince William, the family could not have looked happier at the early morning drop off.

While Charlotte and George dressed in the school's traditional navy blue and red uniforms, Charlotte has already found a clever way to show off her bubbly personality: on her backpack!

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Princess Charlotte's first day of school
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Princess Charlotte's first day of school
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge gestures as she arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school at Thomas's Battersea in London, with her brother Prince George and her parents the Duke and Duchess of Cambridge on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Helen Haslem (right), head of the lower school greets Princess Charlotte as she arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge gestures as she arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, with her brother, Britain's Prince George of Cambridge, arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge hides behind her mother Britain's Catherine, Duchess of Cambridge as she arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, with her brother, Britain's Prince George of Cambridge, arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, with her brother, Britain's Prince George of Cambridge, arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge, accompanied by her father, Britain's Prince William, Duke of Cambridge, her mother, Britain's Catherine, Duchess of Cambridge and her brother, Britain's Prince George of Cambridge,arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, accompanied by her father, Britain's Prince William, Duke of Cambridge, her mother, Britain's Catherine, Duchess of Cambridge and her brother, Britain's Prince George of Cambridge, is greeted by Helen Haslem, head of the lower school (R) on her arrival for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, accompanied by her father, Britain's Prince William, Duke of Cambridge, her mother, Britain's Catherine, Duchess of Cambridge and her brother, Britain's Prince George of Cambridge, is greeted by Helen Haslem, head of the lower school (R) on her arrival for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, with her brother, Britain's Prince George of Cambridge, arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge, accompanied by her father, Britain's Prince William, Duke of Cambridge, her mother, Britain's Catherine, Duchess of Cambridge and her brother, Britain's Prince George of Cambridge,arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte, waves as she arrives for her first day at school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte, as she arrives for her first day at school at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte, hides behind her mother the Duchess of Cambridge as she arrives for her first day at school at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day at school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school at Thomas's Battersea in London, with her brother Prince George and her parents the Duke and Duchess of Cambridge on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Helen Haslem, head of the lower school greets Princess Charlotte as she arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Helen Haslem (right), head of the lower school greets Princess Charlotte as she arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte, as she arrives for her first day at school at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
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As mom Kate carried her backpack to school, royal fans were quick to notice a pink sequined unicorn keychain hanging off of Charlotte's backpack!

People spotted that this was not the first time that the 4-year-old had shared her love of the mythical creature. Back in July at Prince William and Prince Harry's polo match, Charlotte ran around carrying a unicorn wristlet from TY (shop it here).

RELATED: Kate Middleton drops off Princess Charlotte

13 PHOTOS
Kate Middleton at school drop off
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Kate Middleton at school drop off
Britain's Princess Charlotte of Cambridge hides behind her mother Britain's Catherine, Duchess of Cambridge as she arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte, hide behind her mother the Duchess of Cambridge as she arrives for her first day at school, with her brother Prince George and her father the Duke of Cambridge at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Helen Haslem, head of the lower school greets Princess Charlotte as she arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge, accompanied by her father, Britain's Prince William, Duke of Cambridge, her mother, Britain's Catherine, Duchess of Cambridge and her brother, Britain's Prince George of Cambridge,arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Helen Haslem, head of the lower school greets Princess Charlotte as she arrives for her first day of school, with her brother Prince George (hidden) and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London.
Princess Charlotte, hides behind her mother the Duchess of Cambridge as she arrives for her first day at school at Thomas's Battersea in London.
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Helen Haslem (right), head of the lower school greets Princess Charlotte as she arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte arrives for her first day of school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
Britain's Princess Charlotte of Cambridge hides behind her mother Britain's Catherine, Duchess of Cambridge as she arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
Britain's Princess Charlotte of Cambridge, with her brother, Britain's Prince George of Cambridge, arrives for her first day of school at Thomas's Battersea in London on September 5, 2019. (Photo by Aaron Chown / POOL / AFP) (Photo credit should read AARON CHOWN/AFP/Getty Images)
LONDON, UNITED KINGDOM - SEPTEMBER 5: Princess Charlotte, waves as she arrives for her first day at school, with her brother Prince George and her parents the Duke and Duchess of Cambridge, at Thomas's Battersea in London on September 5, 2019 in London, England. (Photo by Aaron Chown - WPA Pool/Getty Images)
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