Ashton Kutcher was born in Cedar Rapids on February 7, 1978. After making his debut in the field of fashion and advertising, he plays for the first time a leading role, that of Michael Kelso in the sitcom That '70s Show. In the 2000s he achieved great popularity in the United States, later becoming an actor also known in Europe, above all for Bobby, a 2006 film directed by Emilio Estevez, presented in competition at the 63rd Venice International Film Festival.

During his career he has been nominated multiple times for the Razzie Awards, the Teen Choice Award at the Nickelodeon Kids' Choice Awards and finally received an MTV Movie Awards nomination for Best Comedy Performance.

At the age of 16 Ashton attempted a robbery, together with his cousin, in his high school. Arrested by the police, he is sentenced to 3 years of probation and 180 hours of community service, and loses the possibility of receiving any scholarship. After graduating he enrolled at the University of Iowa in biochemical engineering, paying for his studies by working, but left the faculty after the first year.

Kutcher has been in relationships with several actresses, such as January Jones (from 1998 to 2001), Ashley Scott (from 2001 to 2002), Monet Mazur (2002) and Brittany Murphy (from 2002 to 2003).

In 2012 he began a relationship with actress Mila Kunis, known on the set of That '70s Show. The couple got officially engaged in March 2014. On October 1, 2014, Wyatt Isabelle Kutcher was born. On July 4, 2015, the couple got married in Hollywood. Dimitri Portwood Kutcher, the couple's second child, was born on November 30, 2016.

On April 16, 2009, Kutcher, under the pseudonym Aplusk, became the first Twitter user to have more than a million followers, even beating CNN in the Million followers contest.