Ashton Kutcher, 'Two and a Half Men'

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Where you've seen him: Where haven't we seen him? He's been in a string of romantic comedies lately ("No Strings Attached," "Killers" and "Valentine's Day") but may be best known from his stint on "That '70s Show" and his marriage to Demi Moore.

Character on the show: It's been a roller-coaster casting ride. We're not sure exactly how his character will be on the show. If he continues in the Charlie Sheen mode, his ladies' man chops will come in handy.

Character similarities: He's the suave, desirable guy in many of his movies, though he was not so suave in "That '70s Show," so he should have most bases covered.