You would never have guessed it, but when Brazilian Angel Alessandra Ambrosio walked the runway in that revealing, corseted ballerina costume during last month’s Victoria’s Secret Fashion Show, she was about two months pregnant.

Yep, Ambrosio’s second baby with fiancé Jamie Mazur is on the way, People has confirmed (they already have an adorable 3-year-old girl). And according to Brazilian magazine Istoe Gente (ONTD has a very rough translation), to whom she broke the news, she found out on her birthday, September 23, and is now about four months along. Since we’re amazing mathematicians, we figured out that means she was somewhere around two months pregnant when the show taped on November 9. We’re impressed with her secret-keeping abilities!

This also means she’ll have about six months to get her body back for next year’s Victoria’s Secret Show after she gives birth. We have a feeling she’ll bounce back successfully as she–and all Victoria’s Secret models–are wont to do.