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Children, they grow up so fast.

Princess Charlotte just arrived at her very first day of school at Thomas's Battersea, where her big brother Prince George also happens to be a pupil.

SEE ALSO:Here are some adorable photos of Prince George's first day of school

Kensington Palace posted a video of the moment Charlotte arrived at school, flanked by her parents the Duke and Duchess of Cambridge.

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Charlotte met and shook hands with the head of the lower school, Helen Haslem.

Here are some photos of Charlotte's arrival.

Princess Charlotte meets one of the teachers.Credit: AARON CHOWN/AFP/Getty ImagesFirst day of school.Credit: Aaron Chown - WPA Pool/Getty ImagesCharlotte with her big brother George.Credit: AARON CHOWN/AFP/Getty Images

Best of luck to Charlotte.

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