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Ashton Kutcher, Demi Moore

Jason Merritt/Getty Images

Someone's been punk'd here, and it's not Ashton Kutcher.

The Hollywood hunk went on a Twitter offensive today, ripping Star magazine over allegations he cheated on wife Demi Moore.

"I think Star magazine calling me a 'cheater' qualifies as defamation of character. I hope my lawyer agrees," tweeted Kutcher.

"STAR magazine — you don't get to stand behind 'freedom of the press' when you are writing fiction," he added.

The tabloid drew Kutcher's ire with a story citing an unnamed source who claimed to have witnessed the Valentine's Day star "kissing and groping" an unidentified blonde beauty outside a restroom at the Los Angeles Italian eatery Madeo. The magazine suggesting that the 15-year age difference between Kutcher and  his movie-star missus was beginning to take its toll on their union.

Kutcher, 32, and Moore, 47, are due to celebrate their five-year wedding anniversary on Sept. 24.

We're guessing Star won't be sending flowers.

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