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Those Victoria's Secret models sure know how to bounce back from giving birth!

Alessandra Ambrosio was spotted in Malibu this weekend to play some beach volleyball on the sand, where she showed off her tond stomach on a tank top and bikini bottoms.

Ambrosio, 31, looks amazing, especially considering she gave birth exactly two moths ago -- welcoming her second child, son Noah, on May 7.

The model also has daughter Anja with fiance Jamie Mazur. She was born in August 2008.

See more summer beach bods in the gallery above!

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