These stars kept it in the (onscreen) family.
TV and movie sets are pretty much hotbeds for hooking up. If you want to find love (or, let's be real, just have sex with someone hot), it's a safe bet that being an actor or actress will help with that. But things get complicated when you find out that your crush may not be playing your love interest in whatever project you stalked your way into, but rather, they're starring as your sibling. Which means unless it's some weird Harmony Korine-type project, you probably will never, ever get to make out with said crush without some major re-writes in the mix.
Unless, of course, you're able to seduce that co-star crush in real life. These stars all found love (or, let's be real, just sex with someone hot in some cases) with onscreen siblings, uncles and even parents. It seems a little icky, but it's important to remember that it's not actually incest if they're only related in a script and not by real life blood or genealogy. Here are 19 celebs who hooked up with onscreen family members (and who may or may not have skeeved us all out in the process).
Selena Gomez and David Henrie
Justin Bieber recently unfollowed Selena Gomez on Instagram, as psychologically stunted spoiled brats tend to do. Days later, Gomez was spotted with her Wizards Of Waverly Place co-star David Henrie, who played the onscreen brother, Justin Russo, to her bewitching Alex. Coincidence? Probably not, considering she's just as passive aggressive as her problematic on-again off-again boyfriend.
Susan Dey and David Cassidy
In his book, C'mon, Get Happy ... Fear And Loathing On The Partridge Family Bus, David Cassidy, the onscreen Keith Partridge, dished that his co-star, Susan Dey, who played his sister Laurie, had a huge crush on him. He almost gave her a shot, but wrote, "Susan lacked the slutty aspect of a female that I always found so attractive." Classy.
Jason Priestley and Shannen Doherty
Jason Priestley and Shannen Doherty played twins on Beverly Hills 90210, but he recently confessed to Howard Stern that they hooked up while they were co-stars. That's almost as dramatic as the shenanigans that actually happened on camera.
Peter Krause and Lauren Graham
Peter Krause and Lauren Graham played siblings Adam and Sarah Braverman on Parenthood and have been dating in real life since 2010.
Katherine Heigl and Jason Behr
Rumor has it that Katherine Heigl was just as insufferable on Roswell as she is everywhere else, but her onscreen brother, Jason Behr, apparently found it charming, because they dated til the show ended in 2002.
Jennifer Carpenter and Michael C. Hall
Jennifer Carpenter and Michael C. Hall played foulmouthed Deb and serial killer/blood spatter expert Dexter on Dexter. They married briefly in real life, until rumor has it Julia Stiles got between them, but remained close friends.
Jennifer Grey and Matthew Broderick
Jennifer Grey played Matthew Broderick's irritated older sister in Ferris Bueller's Day Off, but played his paramour in real life. Their relationship eventually went the way of her old nose.
Shane West and Evan Rachel Wood
Evan Rachel Wood was way young when she co-starred with Shane West on Once And Again, but you better believe he noticed when she grew up into a stunning blond bombshell. The pair dated in 2009 when she was 21 and he was 31.
Ian Somerhalder and Maggie Grace
Ian Somerhalder and Maggie Grace played step-siblings on Lost. The "step" part makes their real-life romance in 2006 slightly less creepy.
Hayden Panettiere and Milo Ventimiglia
Save the cheerleader, save the world! Milo Ventimiglia dated Heroes co-star and onscreen niece Hayden Panettiere for over a year, but their 12-year age gap proved to be too much for them to handle. Which is probably eating at him now, seeing as Panettiere is expecting with fiance Wladimir Klitschko, who's 13 years older than she is.
Emily VanCamp and Chris Pratt
Emily VanCamp and Chris Pratt played siblings Amy and Bright Abbott on Everwood and dated while filming.
David Annable and Emily VanCamp
David Annable and Emily VanCamp dated while playing half-siblings on Brothers And Sisters. The writers picked up on their chemistry, and in an effort to make it less creepy for everyone involved, threw in a plot twist making them biologically unrelated so they could hook up. Still weird, though not quite Appalachian-level.
David and Tamela Mann
David Mann plays Tamela Mann's father on Meet The Browns, but in real life they're married and the same age.
Carrie Preston and Michael Emerson
Carrie Preston played Michael Emerson's mother in flashbacks on Lost, but they never actually appeared in any scenes together. That probably made it a lot less awkward when they tied the knot in 2008.
Bruce Campbell and Ellen Sandweiss
Bruce Campbell once said he lost his virginity to Evil Dead co-star Ellen Sandweiss ... who played his sister.
Will Arnett and Amy Poehler
Amy Poehler and Will Arnett were already married when they starred as grossly incestuous ice-skating siblings Stranz and Fairchild Van Waldenberg in Blades Of Glory. The pair have since split.
John Travolta and Diana Hyland
Diana Hyland played John Travolta's mother in the 1976 TV movie The Boy In The Plastic Bubble. Despite an 18-year age difference, the pair dated until her death from breast cancer in 1977.
David Tennant and Georgia Moffett
in 2011, David Tennant married Georgia Moffett, who starred as his cloned daughter on Dr. Who.
Barry Williams and Maureen McCormick
Maureen McCormick revealed in her autobiography that she and onscreen stepbrother Barry Williams couldn't keep their hands off of each other on The Brady Bunch set. The pair began dating when McCormick was 16 and Williams was 18. Who wants to bet he yelled "Marcia Marcia Marcia!" in a totally different context from Jan?