Christopher Ashton Kutcher (/ˈkʊtʃər/; born February 7, 1978), best known as Ashton Kutcher, is an American actor, producer, former fashion model, and comedian, known for his portrayal of Michael Kelso in the Fox sitcom That '70s Show. He also created, produced and hosted Punk'd, and played lead roles in the Hollywood films Dude, Where's My Car?, Just Married, The Butterfly Effect, The Guardian, and What Happens in Vegas. He is also the producer and co-creator of the supernatural TV show Room 401 and the reality TV show Beauty and the Geek. Kutcher currently co-stars in the hit CBS sitcom Two and a Half Men as the character Walden Schmidt.