Channing Tatum and Jenna Dewan Tatum
Channing Tatum met now-wife Jenna Dewan on the set of Step Up. She was totally impressed by his moves.
Renee Zellweger and Jim Carrey
Renee Zellweger and Jim Carrey dated after filiming Me, Myself, & Irene where the two fell in love on a zany road trip.
Alex Pettyfer and Dianna Agron
Alex Pettyfer and Dianna Agron met while filming I Am Number Four. They broke up shortly after the film's release.
Anna Faris and Chris Pratt
While Chris Pratt and Anna Faris' on-screen couple didn't last, in real life, the two have been married since 2009.
Reese Witherspoon and Ryan Phillippe
Reese Witherspoon and Ryan Phillippe met before Cruel Intentions started filming and married shortly after its release. They divorced after 7 years together.
Dev Patel and Freida Pinto
Slumdog Millionaire was an unexpected smash success. The relationship that formed between Dev Patel and Freida Pinto was unexpected as well!
Dominic Cooper and Amanda Seyfried
While these stars dated during the filming of Mamma Mia, neither Dominic Cooper and Amanda Seyfried's on or off-screen relationships worked out.
Emma Stone and Andrew Garfield
Emma Stone plays Gwen Stacy to Andrew Garfield's Spider-Man in The Amazing Spider-man 2. Off the camera, the two are crazy in love.
Blake Lively and Ryan Reynolds
Blake Lively and Ryan Reynolds met while filming Green Lantern. Now the two are happily married and Lively's favorite place to relax is by Ryan's side.
Dax Shepard and Kristen Bell
Dax Shepard and Kristen Bell have been in two films together, When in Rome and Hit and Run. They're married with a baby girl, Lincoln.
Jennifer Lopez and Ben Affleck
Jennifer Lopez and Ben Affleck met while filming Gigli and waited for her divorce from Cris Judd to be final before going public. Then they starred in Jersey Girl and the music video for "Jenny From the Block" (where Ben Affleck LITERALLY KISSED her beautiful backside).
Tim Robbins and Susan Sarandon
One of Hollywood's longest-lasting couples, Tim Robbins and Susan Sarandon played love interests in Bull Durham while together in real life.
Gwyneth Paltrow and Brad Pitt
Brad Pitt has a thing for dating his costars. Pitt dated Gwyneth Paltrow while filming Se7en. The two were engaged but broke up after six months.
Brad Pitt and Angelina Jolie
See? He has a thing. Brad Pitt and Angelina Jolie notoriously got together during the filming of Mr. and Mrs. Smith when he was still married to Jennifer Aniston.
Nicole Kidman and Tom Cruise
After meeting on the set of Days of Thunder, Nicole Kidman and Tom Cruise went on to star in two more films together: Far and Away and Stanley Kubrick's Eyes Wide Shut.
Kristen Stewart and Robert Pattinson
Kristen Steward and Robert Pattinson brought Bella Swan and Edward, her sparkly vampire lover, to life in The Twilight Saga. They dated in real life until she cheated on him with a producer.
Paul Dano and Zoe Kazan
Paul Dano and Zoe Kazan were already a thing when they filmed Ruby Sparks, the screenplay for which was written by Kazan so the couple could star in it together.
Goldie Hawn and Kurt Russell
Another of Hollywood's longest running couples, Goldie Hawn and Kurt Russell played a fake-turned-real-thing couple in Overboard.
David Arquette and Courteney Cox
David Arquette and Courteney Cox met while filming Scream, got married, and eventually had a baby. Then they got divorced and yeah, we were all pretty sad about that.
Sienna Miller and Jude Law
Sienna Miller and Jude Law dated while filming Alfie and eventually married and had children. Then he cheated with their nanny.
Miley Cyrus and Liam Hemsworth
Miley Cyrus and Liam Hemsworth met and fell in love while filming The Last Song. They got engaged and then she went a little nuts. We all know how this ended.
Shia LaBeouf and Carey Mulligan
Shia LaBeouf and Carey Mulligan were introduced by Wall Street's director, Oliver Stone. They dated while filming but ended things shortly after the film's release.
Will Smith and Jada Pinkett Smith
Will Smith and Jada Pinkett Smith had been married for years before filming Ali together, but the did meet on a set: The Fresh Prince of Bel Air.
Zac Efron and Vanessa Hudgens
Zac Efron and Vanessa Hudgens grew up together on the set of various High School Musical movies, eventually dating and then breaking up.
Ben Stiller and Christine Taylor
Ben Stiller and Christine Taylor met in 1999 and were married in 2000. They starred as Derek Zoolander and Matilda in the comedy Zoolander.