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Their chemistry wasn't just because they're good actors...

Glenn Gaslin
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1 of 20 Kevin Mazur/Getty Images for TNT

Kaley Cuoco and Johnny Galecki

The Big Bang Theory's Penny and Leonard went on their first date in Season 1 and got married in Season 9. The actors who portray them, Kaley Cuoco and Johnny Galecki, dated for two years and managed to keep their relationship a secret from everyone, including those in the cast and crew.

2 of 20 Jeff Spicer/Getty Images

Kit Harington and Rose Leslie

Jon Snow and Ygritte got hot and heavy in a cave before Ygritte met her untimely end in Season 4 of Game of Thrones. In real life, Kit Harington and Rose Leslie have been on-again, off-again since 2012.

3 of 20 Mike Coppola/Getty Images

Cole Sprouse and Lili Reinhart

These two Riverdale stars apparently could not keep their hands to themselves at 2017's Comic-Con in San Diego. If you snooze, you lose, Archie!

4 of 20 Kevin Winter/Getty Images

Zac Efron and Vanessa Hudgens

High School Musical was a mega hit for the Disney Channel, and its romantic leads ended up dating each other for five years. But, according to a recent interview with Vanessa Hudgens on Access Hollywood, the two no longer speak.

5 of 20 Rabbani and Solimene Photography/WireImage

Adam Brody and Rachel Bilson

Summer and Seth were The O.C.'s cutest couple, and co-stars Rachel Bilson and Adam Brody were just as much in love. They dated for three years, broke up in 2006, and now share custody of their two dogs, Penny Lane and Thurmen Murmen.

6 of 20 Getty Images

Katie Holmes and Joshua Jackson

Pacey, Joey and Dawson had the love triangle to end all love triangles. Life imitated art, as Holmes and Jackson dated during the first season of the show. But while Joey and Pacey ultimately ended up together on Dawson's Creek, the couple split in real life.

7 of 20 Jamie McCarthy/Getty Images

Blake Lively and Penn Badgely

"Serena and Dan were spotted dating from 2007 to 2010. Why'd they break up? I'll never tell." - xoxo, Gossip Girl

8 of 20 Gregg DeGuire/WireImage

Josh Dallas and Ginnifer Goodwin

Looks like Snow White met her Prince Charming! Once Upon a Time stars Josh Dallas and Ginnifer Goodwin met on set and started dating in 2011. Married in 2014, they now have two sons and are living happily ever after.

9 of 20 Thearon W. Henderson/Getty Images

Mila Kunis and Ashton Kutcher

Kelso and Jackie were on-again, off-again throughout the run of That '70s Show. Although they met when the show began in 1998, Mila Kunis and Ashton Kutcher didn't start dating until they were both newly single in 2012. They've been married since 2015 and have two children together.

10 of 20 Allen Berezovsky/WireImage

Kat Dennings and Nick Zano

Zano's character Johnny could not stop flirting with Dennings' character Max on the series Two Broke Girls. Apparently this carried over into real life, because the two began dating in 2011.

11 of 20 Jon Kopaloff/FilmMagic

Chad Michael Murray and Sophia Bush

The romance between Brooke Davis and Lucas Scott on One Tree Hill was never meant to be, and neither was the real-life romance between Murray and Bush. The two separated after only five months of marriage.

12 of 20 Tommaso Boddi/WireImage

Robert Herjavec and Kym Johnson

When they met on Dancing with the Stars, Herjavec was battling major depression after his divorce from his wife of 24 years. "I met Kym, and I was scared. But it was like a ray of sunshine," he said. The two are now happily married.

13 of 20 Jeff Kravitz/FilmMagic

Tori Spelling and Brian Austin Green

David Silver and Donna Martin were one of the biggest relationships on Beverly Hills, 90210. When Tori Spelling was on Celebrity Lie Detector in 2015, she took a polygraph test which revealed that she had hooked up with her on-screen boyfriend Brian Austin Green during their time as co-stars.

14 of 20 Michael Tran/FilmMagic

Anna Paquin and Stephen Moyer

True Blood's Anna Paquin and Stephen Moyer met during their screen test for the show and sparks flew. Once they got to set, all bets were off. "By day three or four -- oh, this is going to sound so syrupy -- but I knew I wanted to spend the rest of my life with her," said Moyer. The two tied the knot in 2010.

15 of 20 Michael Loccisano/FilmMagic

Jennifer Morrison and Jesse Spencer

These two fell in love and got married as Allison Cameron, M.D. and Robert Chase, MBBS on the Fox drama House. Morrison and Spencer were engaged in real life, but split before they tied the knot.

16 of 20 Gregg DeGuire/WireImage

Alexis Bledel and Vincent Kartheiser

Alexis Bledel had a steamy, multi-episode arc with Vincent Kartheiser on Season 5 of Mad Men, but the two remained professional until the season wrapped. Since then, they've gotten married and welcomed a son.

17 of 20 Ron Galella, Ltd./WireImage

Jason Segel and Linda Cardellini

Cult classic television show Freaks and Geeks brought together Jason Segel and Linda Cardellini, but their eventual breakup gave us something too. Apparently, the couple's split helped inspire Segel to write Forgetting Sarah Marshall.

18 of 20 Ron Galella/Getty Images

Keri Russell and Scott Speedman

Felicity Porter had to decide between Noel and Ben on Felicity, ultimately choosing Ben in the end. In real life, Keri Russell dated her television beau, Scott Speedman, during the latter half of the show's run.

19 of 20 Jason LaVeris/FilmMagic

Emily VanCamp and Josh Bowman

The relationship between VanCamp and Bowman's characters on Revenge is the epitome of tumultuous, with her wanting to exact revenge on his entire family and him shooting her in a fit of jealousy. Luckily, their real life isn't nearly as crazy: The two got engaged in May of 2017.

20 of 20 David Livingston/Getty Images

Lisa Rinna and Harry Hamlin

Lisa Rinna and Harry Hamlin have been married since 1992 and they've been betrothed on television as well. On Veronica Mars, however, their relationship was fraught with abuse and addiction, which is happily not the case off the show.