What Happens in Vegas... Cast and Crew
| Cast |
 Cameron Diaz - (Joy McNally) |
 Ashton Kutcher - (Jack Fuller) |
 Rob Corddry - (Steve "Hater" Hader) |
 Lake Bell - (Tipper) |
 Dennis Farina - (Banger) |
 Krysten Ritter - (Kelly) |
 Queen Latifah - (Dr. Twitchell) |
 Michelle Krusiec - (Chong) |
 Jason Sudeikis - (Mason) |
 Ben Best - (Cab Driver) |
 Zach Galifianakis - (Dave the Bear) |
 Treat Williams - (Jack Fuller Sr.) |
| Deirdre O'Connell - (Mrs. Fuller) |
| Ricky Garcia - (Fuller Closets Worker) |
 Andrew Daly - (Curtis) |
| Benita Robledo - (Maid) |
| Dennis Miller - (Judge Whopper) |
 Amanda Setton - (Hot Woman) |
| Toni Busker - (Hot Woman #2) |
| Jessica Mckee - (Cute Girl) |
| Ricardo Walker - (Male Cop/Stripper) |
| Valerie Orlik - (Female Cop/Stripper) |
| Clem Cheung - (Fruit Guy) |
| Eric Zuckerman - (Tour Guide) |
| Caroline Willman - (Sammy) |
| Tommy McGoldrick - (Uncle Pat) |
| Billy Eichner - (Band Leader) |
| Maddie Corman - (Joy's Lawyer) |
| Jerry V Lindsay - (Wedding Chapel Priest) |
| Samantha Ridge - (Tourist) |
| Richard Schaeffer - (NYMEX Trader #1) |
| Michael P Molnar - (NYMEX Trader #2) |
| Ciaran T O’kelly - (NYMEX Trader #4) |
| Jennifer Trier - (Aunt Fuller) |
| Michael Harkins - (Team Leader) |
| Patrick Knighton - (Team Leader #2) |
| Adam Zuniga - (Mr. Chong / Brainiac) |
| Aaron Nauta - (Hater's Friend #1) |
| Christopher Negrin - (Hater's Friend #2) |
| Brittany Dawn Beall - (Party Girl #2) |
| Ariel Shafir - (Party Guy #2) |
| Sheena Alonzo - (Amanda Diamond) |
| Bradley Morone - (Club Manager) |
| John Eisenberg - (NYMEX Trader #3) |
| Bob Golden - (Jazz Trio Member) |
| Ron Carter - (Jazz Trio Member) |
| Evan Palazzo - (Jazz Trio Member) |
| Jason Davis - (Ballroom Band Member) |
| Ulysses Owens - (Ballroom Band Member) |
| Michael Rodoja - (Ballroom Band Member) |
| Jules Hartley - (Ballroom Band Member) |
| Maya Jenkins - (Ballroom Band Member) |
| Dave Gibson - (Ballroom Band Member) |
| Brian Wixson - (Ballroom Band Member) |
| Justin Flynn - (Ballroom Band Member) |
| Josh Tane - (Ballroom Band Member) |
| Russ Spiegel - (Ballroom Band Member) |
| Martinez Little - (Ballroom Band Member) |
| Director |
| Tom Vaughan |
| Producer |
| Dean Georgaris |
| Arnon Milchan |
| Joseph M Caracciolo |
 Michael Aguilar |
 Shawn Levy |
| Jimmy Miller |
| Writer |
 Dana Fox |
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