"What Happens in Vegas" is a 2008 American romantic comedy film directed by Tom Vaughan and written by Dana Fox. The movie stars Cameron Diaz and Ashton Kutcher as a couple who get married and win a casino jackpot prize during a drunken night in Las Vegas. However, their simple plan to get a quick divorce and divide the money is complicated by the divorce court judges ruling. The title is based on the Las Vegas marketing catchphrase "What Happens in Vegas, Stays in Vegas".

The movie received generally negative reviews from critics, with a rating of 25% on Rotten Tomatoes and a score of 36 out of 100 on Metacritic. Despite the negative reviews, the movie was a commercial success, grossing $80.3 million in the United States.

In summary, "What Happens in Vegas" is a romantic comedy movie about a couple who get married and win a casino jackpot prize during a drunken night in Las Vegas. The movie received negative reviews from critics but was a commercial success.