First gained recognition for playing Jackie Burkhart on the TV series That '70s Show, then went on to star in such films as Forgetting Sarah Marshall, Friends with Benefits, Ted, Oz the Great and Powerful, Bad Moms and Black Swan. She also provides the voice for Meg Griffin on the animated series Family Guy.
She enrolled in acting classes at age nine, where she met her future manager.
She made her big screen debut in the 1995 film Piranha. Prior to landing her leading role on That '70s Show, she appeared on such series as Days of Our Lives, Baywatch, 7th Heaven and Walker, Texas Ranger.
She dated former child star Macaulay Culkin from 2002 to 2011 then got married to That '70s Show co-star Ashton Kutcher in July 2015. She and Kutcher had their first child, a daughter named Wyatt, on October 1, 2014. She gave birth to their second child, a son named Dimitri, on November 30, 2016.
She starred alongside Natalie Portman in the 2010 thriller Black Swan.