Celebrity Pics: The Best Abs in Hollywood

And secrets to how they sculpted them.

By Kate Zimmerman

Best Abs: Lady Gaga

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Lady Gaga

With the revealing wardrobe she rocks, Lady Gaga's body has to be at its best at all times. The superstar, seen here leaving the Late Show with David Letterman in NYC on May 23, 2011, hits the gym for sweat sessions with celeb trainer Harley Pasternak, who told us his top tips for keeping all of his A-list clients in amazing shape.

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