Kate Middleton's Kids Bake Her a Cake for Mother's Day!

Catherine, Duchess of Cambridge (AKA Kate Middleton) got a sweet surprise!

The 39-year-old royal was treated to a special cake from her children with Prince William – George, 7, Charlotte, 5 and Louis, 2 – in celebration of the annual holiday, which was shared on the Kensington Royal Instagram on Sunday (March 14).

PHOTOS: Check out the latest pics of Kate Middleton

“Celebrating two other special mothers today ❤️ 🎂 made by George, Charlotte and Louis,” the royals captioned the post, which featured a sweet photo of the homemade cake, as well as a vintage photo of Kate Middleton and her mother, Carole.

In addition to the cake, the kids also made some very sentimental cards for the late Princess Diana in her memory. See them here.