Fans have been howling over Taylor Lautner, who has packed on 30 pounds of muscle to play werewolf Jacob in the Twilight sequel New Moon, usmagazine.com reports.

“It’s actually quite uncomfortable knowing so many people are seeing that!” Lautner, 17, toldusmagazine. com. “It’s a little bit embarrassing!”

Beefing up took “a lot of hard work,” said Lautner, who also goes shirtless in the sequel.