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Bradley Cooper

VLNY / Zodiac / Splash News

Whoa, Bradley Cooper has packed on some serious muscle! 

The American Hustle hunk showed off his new buff bod as he exited a gym, just a day after he returned from his European vacation with model-girlfriend Suki Waterhouse.

The star sported a thick beard, dark sunglasses, a baseball cap and athletic shorts. Although, he attempted to remain incognito, it was definitely hard not to notice that the sexy 39-year-old could barely contain his massive muscles in his tight workout shirt!

The handsome actor has bulked up to play Navy SEAL Chris Kyle in Clint Eastwood's upcoming movie American Sniper, which began shooting today at Blue Cloud Ranch in Los Angeles. 

Over the weekend, the Oscar nominee and his 22-year-old ladylove put breakup rumors to rest with a romantic stroll in Paris. The cute couple was all smiles while they visited the famous Pont de l'Archevêché bridge and Notre Dame Cathedral with the British beauty's little sister Imogen.