Giuliana Rancic's son Duke is getting so big!

Over the weekend, the 41-year-old Fashion Police host took to Instagram to share photos of her son celebrating his 3rd birthday — and the pics are cuter than cute!

"My little boy today on his 3rd birthday. Thank you for teaching me what life is really about. Even though you're now a little boy, you will always be my baby. Happy Birthday, Duke ❤️," the proud mom captioned one snapshot of Duke at his birthday party.

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Based on all the photos from his special day, Duke and his parents, Giuliana and Bill Rancic, celebrated his birthday with a party that included a bounce house, colorful balloons, fun water sprinklers and plenty of stuffed animals!

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Happy 3rd Birthday Mr. Duke!!!!

A post shared by Bill Rancic (@billrancic) on

"Happy 3rd Birthday Mr. Duke!!!!" Bill, 44, captioned a pic on his Instagram of his son playing in a bathing suit. Giuliana and Bill married in Capri, Italy in September 2007 and welcomed Duke — their only child — via surrogate in August 2012.