Ashton Kutcher and Mila Kunis
The running joke during That 70s Show was that Ashton Kutcher and Mila Kunis should date in real life. Now they're engaged with a baby on the way.
Kat Dennings and Nick Zano
Kat Dennings and Nick Zano from 2 Broke Girls are together in real life even if their characters would mark "It's Complicated" on Facebook.
Hayden Panettiere and Milo Ventimiglia
Hayden Panettiere and Milo Ventimiglia's characters didn't date on Heroes because he was her long lost uncle. That didn't stop the fandom from wishing they were together.
Milo Ventimiglia and Alexis Bledel
Milo has a habit of dating his costars! He was romantically linked to Alexis Bledel while the two played Rory Gilmore and Jess Mariano on Gilmore Girls.
Alexis Bledel and Vincent Kartheiser
Looks like Alexis Bledel picked up Milo's habit! She's engaged to Mad Men costar Vincent Kartheiser.
Will Arnett and Amy Poehler
Will Arnett and Amy Poehler played odd couple Gob and Gob's wife on Arrested Development. In real life they're divorced after 7 years of marriage.
Ian Somerhalder and Nina Dobrev
Ian Somerhalder and Nina Dobrev's chemistry as Damon Salvatore and Elena Gilbert is so electric they have their own real-life fandom of Nian shippers who are devasted that the two are no longer together.
Jesse Spencer and Jennifer Morrison
Jesse Spencer and Jennifer Morrison's on-screen relationship began as friends with benefits and ended in post-divorce sex. Off-screen the two were together but didn't make it to marriage.
Ginnifer Goodwin and Josh Dallas
Once Upon a Time's Snow White, Ginnifer Goodwin, found her Prince Charming in Josh Dallas. The two are happily married on screen and off.
Jennifer Garner and Michael Vartan
Jennifer Garner and Michael Vartan were Sydney Bristow and Michael Vaughn on Alias. Her relationship with Vartan came so quickly after her separation from Scott Foley that many speculated she'd been cheating on her husband.
Keri Russell and Scott Speedman
Keri Russell and Scott Speedman met on the set of Felicity (where Jennifer Garner met Scott Foley). Russell and Speedman were a real-life Felicity and Ben for several years.
Rose Leslie and Kit Harington
Rose Leslie and Kit Harington heat up Game of Thrones as Jon Snow and Ygritte. (As if GoT needs any more heat...) They're also a couple in real life.
Chad Michael Murray and Sophia Bush
Chad Michael Murray and Sophia Bush met, married, and divorced in the span of a few seasons of One Tree Hill. Shortly after, Brucas went their separate ways on screen.
Rachel Bilson and Adam Brody
Rachel Bilson and Adam Brody were Seth and Summer on The OC. They dated in real life, but now he's married to Gossip Girl alum...
Leighton Meester and Sebastian Stan
Leighton Meester. Sebastian Stan was her on and off-screen boyfriend during their time together on Gossip Girl. Dating costars was definitely a thing on that set because...
Blake Lively and Penn Badgley
Blake Lively and Penn Badgley dated while on the CW's series. They didn't last, however, because Blake traded up for Ryan Reynolds.
Jason Segel and Linda Cardellini
While on Freaks and Geeks, Jason Segel and Linda Cardellini dated for a few years after their show was cancelled.
Emily VanCamp and Josh Bowman
While Daniel Grayson and Emily Thorne are now mortal enemies, off camera Emily VanCamp and Josh Bowman are very much a thing.
Lisa Rinna and Harry Hamlin
Lisa Rinna and husband Harry Hamlin were cast as dysfunctional married couple Aaron and Lynn Echolls on Veronica Mars.
Melissa Benoist and Blake Jenner
Melissa Benoist and Blake Jenner were both newcomers to Glee when they met. Before their first season was completed, the two were engaged.
Anna Paquin and Stephen Moyer
Things might not go well for Bill and Sookie, but in real life Anna Paquin and Stephen Moyer are living their happily ever after.