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Ashton Kutcher, Ellen DeGeneres Show

Michael Rozman/Warner Bros.

No good deed goes unpunished, does it?

After Ellen DeGeneres joined the stars of Two and a Half Men on their latest stripped-down, "All Will Be Revealed" billboard, Ashton Kutcher made sure to return the favor when he showed up to tape the season premiere of Ellen, airing Monday.

Well, at first he was wearing a robe when DeGeneres went to his dressing room to check on him.

"We're going to start pretty soon, so...maybe you want to change?" she asked him.

"Oh no, I'm ready," Kutcher replied. "This is it...[The new Two and a Half Men ad] is getting a lot of attention. So I just figured I'm going to do everything nude from now on."

"I don't know if that's a good idea. Really?" DeGeneres said, feigning discomfort.

"Yeah," Kutcher retorted. "Whatever I'm doing, I'm just going to do it nude. Let's do this!"

Actually, we're kind of surprised that Charlie Sheen hadn't done this already.