Prince George and Princess Charlotte are officially back at school! Today marked Charlotte's first time at Thomas's Battersea in London, where her brother has been attending since 2017. Joined by their parents, the Duke and Duchess of Cambridge, the royal siblings made a charming arrival in their matching uniforms. From their iconic silly faces, to Kate Middleton giving sweet advice to Charlotte, these two siblings are surely in for a fun school year. Click through to see the cutest photos from their first day.

Prince George and Princess Charlotte smile for a sweet school portrait in their Thomas's Battersea uniforms.

The siblings hold hands with their parents, the Duke and Duchess of Cambridge.

Princess Charlotte shakes hands with a staff member from Thomas's Battersea.

Prince George and Princess Charlotte make silly faces as they approach school. Prince George is the epitome of our morning mood.

Kate Middleton stuns in a floral dress by Michael Kors for the big day.

Princess Charlotte makes a silly face as she waves to photographers.

Prince William and Kate watch as Princess Charlotte makes introductions.

Charlotte clings onto her mother's hand as they draw nearer to Thomas's Battersea. Soon after, Kate was heard giving her some encouraging advice.

Princess Charlotte looks so adorable in her uniform!

Hiding behind her mother, Princess Charlotte shows a rare moment of sheepishness.

The royal siblings look a little nervous as they take in the school entrance.

George and Charlotte make their way into the building for their first official day.