Kate, 37, and William, also 37, were all smiles as they dropped of their two eldest children for their first day of school at Thomas's Battersea in London.
William kept his outfit professional in a button down shirt, brown slacks and a blue sports jacket as he held George's hand.
Charlotte, 4, who seemed shy for her very first day of school, hid behind her mother's legs as they made their way across the campus.
The Princess and her big brother George, 6, looked adorable in navy blue and red uniforms that are required by the private school. The school reportedly costs their parents a whopping $23,000 a year to attend!
Before making their way inside, the family met with the head of lower school, Helen Haslem, who shook the kids' hands and then introduced herself to the Duke and Duchess of Cambridge.
What do you think of William and Kate dropping off George and Charlotte to their first day of school? Let us know in the comments below!