Princess Charlotte is all smiles as she arrives for her first day of school with Prince George

The big day is finally here!

Four-year-old Princess Charlotte has arrived for her first day of elementary school at Thomas's Battersea in London.

Joined by her parents, the Duke and Duchess of Cambridge, and her six-year-old brother, Prince George, for the momentous day, the young royal made a charming arrival in her brand new uniform.

Photographed making her way into the school – dressed in the academic institution's navy, red and white uniform – Charlotte gripped her mother's hand before confidently greeting a teacher at the school, by shaking the teacher's hand.

As she turned to walk through the doors, Charlotte tentatively looked towards photographers and gave a small wave.

Kate Middleton - who looked stunning in her Michael Kors floral printed dress - and Prince William carried their children's backpacks as they made their way to the school's entrance.

Despite being the newbie on campus, Charlotte likely won't have any problems adjusting to the new environment as she's reportedly "more outgoing" than her brother.

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Plus, earlier this week, it was predicted "protective" George - will help his younger sister settle into her new school.

Royal biographer Penny Junor said: "Prince George is a very protective and lovely older brother.

"I'm sure he'll look after his little sister and take great pride in showing her the ropes."

The milestone marked a special moment for the family - when George started at the same school two years ago, Kate was unable to join him because she was ill with severe morning sickness during her pregnancy with Prince Louis.

Thomas's London Day School is located on Battersea High Street in south-west London.