The Hottest Boys of Summer

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Ryan Phillippe

The actor took a break from a motorcycle ride around L.A. earlier this month.

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Adrian Grenier

Two weeks after his show's new season premiered on HBO, the Entourage star celebrated by taking a dip in the ocean while in Miami in late July.

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Shia LaBeouf

The 23-year-old showed off the benefits of becoming an action star -- he dodged giant robots in two Transformers movies -- while working out near his home in L.A. in July.

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Matthew McConaughey

"I connected with the surfing philosophy. Riding the wave. No wide turns. It's how I go about living life. It always takes you to a different place," the oft-shirtless Ghosts of Girlfriends Past hunk (here in May) has said. "But that's what I like about living out there in Malibu. Even if there's no surf, you're in some great spot with a beach."

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Spencer Pratt

What does The Hills villain use as motivation to stay in shape this summer? His wife Heidi Pratt's music videos. "What do you think I work out to every day? I know the whole thing by heart!" he tells Us.

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Mario Lopez

The Extra host and author of 2008's Mario Lopez's Knockout Fitness doesn't mind sharing a few slim-down secrets. "What we need to do is build you up to my level in a way that maximizes effectiveness, ensures safety -- and guarantees that you have a blast in the process," he writes. "Because if you're not having fun, you'll never stick with it."

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Kellan Lutz

The Twilight hottie -- and former Abercrombie & Fitch model -- is constantly traveling, but don't expect him to skip out on his daily workouts. "It's really frustrating for me because I've been on way too many airplanes," Lutz (here, with his dog in May) has said. "I tried to do push-ups but the aisle wasn't big enough."

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Robert Pattinson

Prior to his breakout role in Twilight, Pattinson's shirtless scenes almost ended up on the cutting room floor. "I was just trying to lose, like, every ounce of body fat so when I took off my shirt, I would look like an alien," Pattinson has said. "The idea of taking my shirt off and looking like some sort of Adonis? Everyone would just laugh." At the director's request, he beefed up for the sequel, New Moon, while filming in Italy, in May.

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Jerry O'Connell

When the actor first arrived in Hollywood, he packed on the pounds with endless partying and tipped the scales at more than 200 pounds. Today, the beefy husband of Rebecca Romijn is fitter than ever. "I found that just by cutting out booze, salt, and dressings, the fat just drips off you," the star has said.

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Ed Westwick

While visiting girlfriend and Gossip Girl costar Jessica Szohr in Los Angeles in May, Westwick looked healthy and in shape, despite In Touch reports that his expanding waistline forced the CW show's wardrobe department to keep changing his clothes. "It's ludicrous!" he has said.

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Jared Leto

Although the actor gained 62 pounds for 2006's Chapter 27, in which he played John Lennon's assassin, he was able to lose the weight in just a few months. Since then, Leto has kept the pounds off while touring with his band, 30 Seconds to Mars, and filming the upcoming Mr. Nobody with Diane Kruger.

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Chris Pine

Captain Kirk's portrayer in the new Star Trek film took a stroll in Los Angeles in May.

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DAVID BECKHAM

Between his Armani underwear ads and his goal-winning soccer skills, Beckham has been turning heads both on and off the field -- but he doesn't always welcome the attention. "Without a doubt, out on the field is where I'm most comfortable, where I'm happiest, because I know what I'm doing, and I know I can do it," the soccer stud (here, after a game in London in April) once said.

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Zac Efron

The 17 Again star took a break from filming a Funny or Die pool party sketch with girlfriend Vanessa Hudgens, Brittany Snow, Brody Jenner, Nicole Richie and others in May.

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Doug Reinhardt

Paris Hilton's former beau shouldn't have a hard time finding a new lady with a beach bod like this! The former Hills star got some sun in the sand in Hawaii in March.