What Happens in Vegas
- Taon: 2008
- Bansa: United States of America
- Genre: Comedy, Romance
- Studio: Penn Station Entertainment, Regency Enterprises, 21 Laps Entertainment, Dune Entertainment III, Mosaic Media Group, 20th Century Fox, Monarchy Enterprises B.V., Fox
- Keyword: hotel, casino, roommates, romantic comedy, rivalry, wedding, las vegas, drinking, opposites attract, aftercreditsstinger, marriage counselling, accidental marriage, vegas wedding, credits cookie
- Direktor: Tom Vaughan
- Cast: Cameron Diaz, Ashton Kutcher, Rob Corddry, Lake Bell, Jason Sudeikis, Treat Williams