Who starred alongside Cameron Diaz in the 2008 comedy film What Happens in Vegas?
Cameron Diaz: Cameron Michelle Diaz-Madden (born August 30, 1972) is an American actress, comedian, producer, former fashion model and author. What Happens in Vegas: What Happens in Vegas is a 2008 American comedy film directed by Tom Vaughan, written by Dana Fox and starring Cameron Diaz and Ashton Kutcher. What Happens in Vegas:  The title is based on the Las Vegas marketing catchphrase "What happens in Vegas, stays in Vegas."
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