Ashton To Charlie: 'Shut the F*** Up!'

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Ashton Kutcher has had enough of Charlie Sheen's mean tweets.

Kutcher, who replaced Sheen on CBS' Two and a Half Men, had a message for the 48-year-old actor on Wednesday's Jimmy Kimmel Live. "Dude, shut the f**k up!" Kutcher said to camera. "Seriously, like. Enough already. Like it's like three years later and you're still blowing me up on Twitter. Like come on dude, really?"

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Sheen responded to Kutcher via Twitter, writing:

He later responded again, though this time, his tone wasn't so friendly.

The 35-year-old actor did admit that it was tough getting back in the sitcom swing of things. "I thought it was gonna be easy," Kutcher said. "Like from That '70s Show, and then taking a break from doing sitcoms, like jump back into sitcoms. And it actually took me more time than I thought it would to just sort of get my sitcom sea legs again. Get back into the rhythm. And I feel like the show's really got a nice stride right now."

How do you think Ashton is doing on Two and a Half Men?