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.
The actor also dated his co-star in the NBC sci-fi series, for about two years until 2009.
It's been recently revealed that the Riverdale co-stars who play Jughead and Betty are dating IRL!
The two stars of the hit CBS show started dating in 2007 and lasted for two years before calling it quits.
Before Lively met her hubby Ryan Reynolds through another project, she dated her Gossip Girl co-star until 2010.
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.
A fan favorite, the couple had been dating for more than a year before Cory passed away in 2013.
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.
You probably forgot that these two were engaged for a brief period of time before ending things in 2000.
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.
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.
This Game of Thrones power couple has been going strong for a while now!
The new couple originally met while working together on The Voice as coaches.
This cute couple recently welcomed a baby into the world after they got together while working on their Fox TV series, Gotham.
Young love! This couple started dating after working together on Vampire Academy.
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.
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.
The pair got together after working on Step Up in 2006. They got married in 2009 and have a baby girl named Everly together.
After working together on Chicago P.D., these two gorgeous actors kept the romance going.
The teen stars later became a real-life couple and ultimately married. They now have two children together.
This gorgeous couple met on the set of Fantastic Four and got married in 2008. They now have two daughters together.
This cute couple met while working on Black Swan. They married in 2012 and have one child together, Aleph.
This hot, young duo met while filming The Amazing Spider-Man. They lasted several years before breaking up in 2015.
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.