Celebrity Armed & Dangerous: Biggest Guns of the Year The hottest accessory in Hollywood? A set of bulging biceps! Take a look at who muscled their way through '09! By Cara Lynn Shultz Published on December 8, 2009 12:00 PM Share Tweet Pin Email Trending Videos 01 of 09 ZAC EFRON Starsurf/Splash News Online Look out Matt Damon, there's a new buff star on the block! The actor is muscling his way out of teen musicals into more adult roles, having recently signed on for a "sexy thriller," according to Hollywood Reporter. "I like backpacking, hiking, surfing, swimming, playing tennis – things that get you active and are also fun," he told PEOPLE. 02 of 09 JAKE GYLLENHAAL Andrew Cooper/Walt Disney/Courtesy Everett Even Gyllenhaal's Lego figurine has buff arms! The actor got ripped for the sake of art, to play Prince Dastan in next year's Prince of Persia: The Sands of Time. "I've gotten buff," he told Entertainment Tonight. "I over-prepared myself because I never knew how much they were going to ask me to do." 03 of 09 MICHELLE OBAMA Never before has a First Lady's figure been such a hot topic! Obama's penchant for sleeveless dresses showed off her toned triceps – hard-earned arms, since she begins working out at 4:30 a.m. "I enjoy arm exercises because you can see what it's hitting," she told Prevention. 04 of 09 KELLY RIPA Sara Jaye Weiss/Startraks The talk-show host has said she didn't start working out until she hit her thirties – and now her arms are among the most envied in Hollywood. "I am totally hooked on this sculpting class I discovered," she told Fitness. "I could see a difference within five classes." 05 of 09 RYAN REYNOLDS Courtesy EW The actor famously was 3 percent body fat during Blade: Trinity – and he's still in fighting form. Reynolds flaunted his figure on the cover of Entertainment Weekly to promote X-Men Origins: Wolverine, starring the famously ripped Hugh Jackman. "I'd actually just bench press Hugh as much as I could right before each take," he joked. 06 of 09 TAYLOR LAUTNER Kimberley French/Summit Although the New Moon star has said he doesn't "want to become known as just a body" – what a body it is! He packed on 30 lbs. of muscle to play werewolf Jacob in the series, and will continue to build the muscle until shooting wraps on the final film, Breaking Dawn. 07 of 09 KELLAN LUTZ Beetham/Whittle/Splash News Online He helped costar Taylor Lautner pump up for New Moon, and Lutz – who plays the brawny vampire Emmett in the series – says he "loves push-ups. Those are the easiest thing for me." 08 of 09 MADONNA Eduardo Verdugo/AP Who says you can't be ripped in your fifties? The icon continues to get people talking – and the most recent subject are her bulging biceps, which show the results of her regular Ashtanga yoga exercises. 09 of 09 HUGH JACKMAN Carlos Costa/Pacific Coast News His charm and movie-star good looks may have helped Jackman nab the Sexiest Man Alive title last year, but let's face it, who can forget about that body? The actor flexed some serious muscle this year in X-Men Origins – working out for an hour to 90 minutes and reportedly putting on 15 extra pounds of muscle!