Milo Ventimiglia & Alexis Bledel in Gilmore Girls
Before Ventimiglia starred in the hit series This Is Us, he was the Jess to Bledel's Rory in Gilmore Girls. Meanwhile, the pair dated behind the scenes from 2002 to 2006.
Milo Ventimiglia & Hayden Panettiere in Heroes
The actor also dated his co-star in the NBC sci-fi series, for about two years until 2009.
Cole Sprouse & Lili Reinhart in Riverdale
It's been recently revealed that the Riverdale co-stars who play Jughead and Betty are dating IRL!
Kaley Cuoco & Johnny Galecki in The Big Bang Theory
The two stars of the hit CBS show started dating in 2007 and lasted for two years before calling it quits.
Blake Lively & Penn Badgley in Gossip Girl
Before Lively met her hubby Ryan Reynolds through another project, she dated her Gossip Girl co-star until 2010.
Jennifer Lawrence & Nicholas Hoult in X-Men: First Class
The mutant co-stars dated for 5 years before calling things off in 2014. Lawrence has said that it was difficult managing her breakup with Hoult around the same time The Hunger Games franchise was wrapping up.
Lea Michele & Cory Monteith in Glee
A fan favorite, the couple had been dating for more than a year before Cory passed away in 2013.
Jude Law & Sienna Miller in Alfie
After dating for less than a year, the couple were engaged by Christmas 2004. After a tumultuous relationship and a few affairs, they officially broke things off in 2006.
Jim Carrey & Renee Zellweger in Me, Myself & Irene
You probably forgot that these two were engaged for a brief period of time before ending things in 2000.
Gwyneth Paltrow & Brad Pitt in Se7en
Pitt and Paltrow were actually engaged for a short period of time in the 90s. Looking back at it more recently, she has said that he was "too good" for her.
Tom Cruise & Nicole Kidman in Days of Thunder
When the two co-stars met in 1990, there was an instant connection. When Kidman was only 23, the pair wed and by the time she was 27 they had adopted two children. In 2001, after 11 years of marriage, they finalized their divorce.
Kit Harington & Rose Leslie in Game of Thrones
This Game of Thrones power couple has been going strong for a while now!
Gwen Stefani & Blake Shelton
The new couple originally met while working together on The Voice as coaches.
Ben McKenzie & Moren Baccarin
This cute couple recently welcomed a baby into the world after they got together while working on their Fox TV series, Gotham.
Sarah Hyland & Dominic Sherwood
Young love! This couple started dating after working together on Vampire Academy.
Ryan Gosling & Eva Mendes
The hunky actor started dating his gorgeous girlfriend after they filmed The Place Beyond the Pines together. Now, they are mom and dad to two daughters together.
Kristen Stewart & Robert Pattinson in Twilight
The Twilight stars dated for years before calling it quits after Stewart was caught kissing director Rupert Sanders while filming Snow White and the Huntsman.
Channing Tatum & Jenna Dewan-Tatum
The pair got together after working on Step Up in 2006. They got married in 2009 and have a baby girl named Everly together.
Sophia Bush & Jesse Lee Soffer
After working together on Chicago P.D., these two gorgeous actors kept the romance going.
Ashton Kutcher & Mila Kunis in That '70s Show
The teen stars later became a real-life couple and ultimately married. They now have two children together.
Jessica Alba & Cash Warren
This gorgeous couple met on the set of Fantastic Four and got married in 2008. They now have two daughters together.
Natalie Portman & Benjamin Millepied
This cute couple met while working on Black Swan. They married in 2012 and have one child together, Aleph.
Emma Stone & Andrew Garfield
This hot, young duo met while filming The Amazing Spider-Man. They lasted several years before breaking up in 2015.
Miley Cyrus & Liam Hemsworth in The Last Song
The on-again, off-again pair began dating in 2009 and got engaged in 2012. They called off their engagement and broke up in 2013. By 2016, they had reconciled and have been going strong since.