Ashton Kutcher: Two and a Half Men Will "Go Through the Roof"

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Sorry, Charlie.

Ashton Kutcher is pretty confident about his new role on Two and a Half Men. In an appearance on the Late Show with David Letterman, the 33-year-old said he feels good about the sitcom's return -- without Charlie Sheen.

"You get out [on stage] and the audience goes crazy," the former That '70s Show star said. "I think it's gonna go through the roof. I really do. I've been laughing really hard." 

According to CBS Entertainment President Nina Tassler, Kutcher will assume the alter ego of Walden Schmidt, "an internet billionaire with a broken heart."

Demi Moore's hubby -- who will be earning $700,000 per episode according to a TV Guide report -- is replacing Sheen, 45, who was fired from the show in March. Sheen's character, Charlie Harper, is killed off in the season premiere. 

Kutcher's first episode of Two and a Half Men airs September 19 on CBS.