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Alessandra Ambrosio, Madonna, Gisele Bundchen

PacificCoastNews.com; Getty Images; INFGoff.com

Some women are just born with great bodies (we still love you, though, Blake Lively!). The rest of us have to spend hours in the gym just to squeeze into our favorite pair of jeans— and celebrities are no exception.

They put in some serious blood, sweat and tears (yes, tears—trust us, we've heard stories!) to get these bangin' bods. So we want to celebrate lovely ladies like Halle BerryGwen Stefani and Alessandra Ambrosio, who aren't afraid to hit the gym, bump elbows with the boys and pump a little iron.

Take a look at Hollywood's fittest females and tell us who gets your vote for "most athletic"!