Justin Timberlake Gets Shirtless, Wet on 30th B-Day

Justin Timberlake got wet 'n' wild on his birthday!

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Instead of celebrating the big 3-0 partying with pals (and longtime love Jessica Biel), the singer-turned-actor splashed around in the Pacific Ocean while filming scenes for the movie Now.

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Showing off his chiseled torso and rock-hard abs, Timberlake wore only a pair of wet shoes and khaki pants during the Malibu shoot. A lifeguard remained close to the Social Network actor at all times in case the waves became too rough.

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Any other plans for celebration? "Maybe I'll have a glass of wine or a little whiskey," he told E!'s Giuliana Rancic at the SAG Awards in L.A. Sunday.