E! Online reports the 33-year-old model surprised a 15-year-old bone cancer patient named Karina Xavier on Thursday.
Bundchen showed up at the young beauty's home in Brazil, where the two spent some quality time together and shared makeup tips.
As an aspiring beauty artist, Xavier couldn't pass up an offer to give Mrs. Tom Brady a makeover. "Guess whose makeup I did today!" Xavier enthusiastically wrote.
After her supermodel house guest left, the teen shared a few photos on Instagram.