Also known as:- La fuente del amor
- Quando em Roma
- Однажды в Риме
- Ask çesmesi
- C'était à Rome
- Em Roma
- En la boda de mi hermana
- Kõik algas Roomas
- Kapote sti Romi
- La fontana dell'amore
- Lehit'ahev be'Roma
- Minden kút Rómába vezet
- When in Rome - Fünf Männer sind vier zuviel
- Mark Steven Johnson
- David Diamond
- David Weissman
- Kristen Bell ... Beth
- Josh Duhamel ... Nick Beamon
- Anjelica Huston ... Celeste
- Will Arnett ... Antonio
- Jon Heder ... Lance
- Dax Shepard ... Gale
- Alexis Dziena ... Joan
- Kate Micucci ... Stacy
- Peggy Lipton ... Priscilla
- Luca Calvani ... Umberto
- Keir O'Donnell ... Priest (Father Dino)
- Bobby Moynihan ... Puck
- Kristen Schaal ... Ilona
- Judith Malina ... Umberto's Grandma
- Lee Pace ... Brady Sacks
- Natalie Joy Johnson ... Secretary
- Brian Golub ... Male Secretary
- Charlie Sanders ... Poker Player #1
- Eugene Cordero ... Poker Player #2
- Eric Zuckerman ... Hansom Cab Driver
- Pasquale Esposito ... Police #1
- Valentina Roma ... Nick's Date
- Francesco De Vito ... Cabbie
- Carlo Giuliano ... Wedding Guest #1
- Tommaso Matelli ... Wedding Guest #2
- Bob Dwyer ... Cop
- Ebony Jo-Ann ... Customer
- Erin Miller ... Patron
- Quisha Saunders ... Kim
- Alexa Havins ... Lacy
- Carlo D'Amore ... Italian Translator
- Geoffrey Cantor ... Dr. Moscowitz
- Abe Goldfarb ... Executive #1
- J.T. Arbogast ... Executive #2
- Lawrence Taylor ... Himself
- Shaquille O'Neal ... Himself
- David Lee ... Himself
- Brian Kenny ... Himself
- Gloria Colonnello ... Guest #3
- John Mainieri ... Man in Elevator
- George Deihl Jr. ... News Reporter
- Brook Whitmore ... Guggenheim Party Bartender
- Bing Putney ... Guggenheim Party Waiter
- Elizabeth Olin ... Guggenheim Party Girl #1
- Ghostface Killah ... Guggenheim DJ
- Nico Toffoli ... Wedding guest
- Danny DeVito ... Al Russo
- Billy Horton ... Guggenheim party guest
- Don Johnson ... Beth's Dad
- Ginamarie Russo ... Party Girl
- Sebastian Saraceno ... Himself
- Autumn Anderson ... Guggenheim Party Girl #2
- Kevin Cannon ... Central park character
- Grace Capra ... Wedding Guest
- John Farrer ... Patron - Guggenheim 'Circle of Gold'
- Cassidy Gard ... Guggenheim Party Girl #3
- Danielle McKee ... Secretary
- Paula Mione ... Wedding Guest #4
- Loukas Papas ... Best Man
- Artie Pasquale ... Wedding Guest
- Frankie Ramos ... Wedding Gues
- Vincent Riviezzo ... Magic Onlooker
- Annamarie Russo ... Party Girl
- Heather Silvio ... Wedding Guest
- Russ Spiegel ... Guitarist / Bandmember
- Tom Stratford ... Party Guy
- Fabio Taliercio ... Wedding Guest
- Denise Vasi ... Gala Hostess
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