Ashton Kutcher was born February 7, 1978 and is an American actor and former fashion model best known for playing Michael Kelso in the FOX sitcom That '70s Show. He was the creator, executive producer, and host of the MTV celebrity prank show Punk'd. He is known for his roles in films such as 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. He is married to actress Demi Moore.

After participating as a modeling contestant in an IMTA competition (losing to Josh Duhamel) in 1998, Kutcher signed with the Next modeling agency in New York, appeared in ads for Calvin Klein, modeled in Paris and Milan, and appeared in a Pizza Hut commercial.

After some success in modeling, Kutcher moved to Los Angeles and, after his first audition, was cast as Michael Kelso in the television series That '70s Show, which debuted in 1998 and ended in 2006. Kutcher was cast in a series of film roles; although he auditioned but was not cast for the role of Danny Walker in Pearl Harbor (2001), he starred in several comedy films that performed well at the box office, including Dude, Where's My Car? (2000), Just Married (2003), and Guess Who (2005). In addition, he appeared in the family film Cheaper By The Dozen, playing a self-obsessed actor. His 2004 film The Butterfly Effect was an unusually dramatic role for Kutcher, playing a conflicted young man who fell in love with a girl called Kayleigh; the film received very mixed reviews, but was a box-office success.

In 2003, Kutcher produced and starred in his own series on MTV's Punk'd as the host. The series involved various hidden camera tricks performed on celebrities. Kutcher is also an executive producer of the reality television shows Beauty and the Geek, Adventures in Hollyhood (based around the rap group Three 6 Mafia), and The Real Wedding Crashers and the game show Opportunity Knocks. Many of his production credits, including Punk'd, come through Katalyst Films, a production company he runs with partner Jason Goldberg.

Because of scheduling conflicts with the filming of The Guardian, Ashton was forced not to renew his contract for the eighth and final season of That 70s Show, though he did appear in the first four episodes of it (credited as a special guest star) and returned for the show's series finale.

Kutcher is part of the management team for Ooma, a tech start-up launched in September 2007. Ooma is in the Voice over Internet Protocol business and Ashton's role is as Creative Director. He's spearheading a marketing campaign and producing viral videos to promote this service. Kutcher has also created an interactive arm of Katalyst called Katalyst Media with his partner from Katalyst Films, Jason Goldberg. Their first site is the animated cartoon, Blah Girls.

Kutcher is due to produce and star in the action comedy Five Killers, in which he will play a hitman.