In the fun snapshot, the birthday girl sticks her tongue out and wears pink braids in her hair — as well as a rhinestone bra top, which Klum helps her model for the camera. "Happy sweet 16 Leni ...

On Thursday, Aug. 22, the singer, 54, shared a Reel on her Instagram filled with sweet throwback ... Rossdale had the crowd sing "Happy Birthday" to him in honor of his 16th birthday.