Sexy Shirtless Stars!

Chris Hemsworth

The Avengers star flaunted his tight abs and chiseled chest in St. Barts, France. To prep for his role as a superhero, Hemsworth had to pack on 20 lbs of muscle. "It wasn't until Thor that I started lifting weights," the hammer-swinging celeb told Men's Health. "It was all pretty new to me."

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