Christopher Ashton Kutcher (born February 7, 1978) is an American actor, producer, and model.  He is known for his portrayal of Michael Kelso in the Fox sitcom That '70s Show. He also created, produced, and hosted Punk'd and had lead roles in the Hollywood films Jobs, Dude, Where's My Car?, Just Married, The Butterfly Effect, The Guardian, and What Happens in Vegas. Starting in 2011, Kutcher starred in the CBS sitcom Two and a Half Men, playing Walden Schmidt.  On April 16, 2009, Kutcher became the first user of Twitter to have more than 1,000,000 followers.