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Gisele Bundchen, Benjamin, Birthday Cake, Ninja Turtles, Instagram

Instagram

Ah, they grow up so fast.

It's hard to believe, but Gisele Bündchen and Tom Brady's son Benjamin is already 4 years old!

The little fella celebrated his big day on Sunday, Dec. 8, with Mommy posting an Instagram photo of his Teenage Mutant Ninja Turtles cake.

"Our little angel is getting so big," the 33-year-old model captioned the pic. "Happy birthday my sweet Benny. We love you so much!"

The Bündchen-Brady family has been in birthday mode for the last few days.

Gisele Bundchen, Benjamin Brady

David Dunleavy/ Splash News

On Dec. 5, Benjamin's little sister Vivian celebrated her 1st birthday.

"One year ago, our lives were blessed with another angel," Bündchen wrote alongside an Instagram photo taken when Vivian was just born. "Thank you sweet Vivi for bringing so much love and joy into our lives, we love you!"

Of course, the Brazilian beauty is certainly no stranger to posting adorable shots.

She recently shared a cute photo of her and Vivian practicing yoga together.