Do you remember when these famous co-stars dated?

Sometimes the real excitement starts after the cameras stop rolling!

In Hollywood, it's commonplace to fall in love with a co-star -- and sometimes the love lasts long past the red-carpet premiere. (Power couple Blake Lively and Ryan Reynolds first met on set of 2010's "Green Lantern"!)

But more often, co-star romances are short-lived and, in retrospect, super weird. Check out these celeb pairings you probably forgot about:

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Do you remember when these co-stars dated?
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Do you remember when these co-stars dated?
Milo Ventimiglia and Alexis Bledel were sweethearts on- and off-screen while co-starring in "Gilmore Girls."
Brooke Shields and Nicolas Cage fell for each other while shooting "Moonstruck" in 1986. 
Casting directors said Ryan Gosling and Rachel McAdams had immediate chemistry during the early stages of "The Notebook" -- and they dated for about three years!
Brat Pack members Emilio Estevez and Demi Moore, who co-starred in "Wisdom," briefly dated.
Here's the story: "Brady Bunch" co-stars (and on-screen siblings) Maureen McCormick and Barry Williams famously dated during the 1970s.
Helen Hunt and Matthew Broderick hit it off after working on 1987's "Project X."
Jessica Biel and Adam Lavorgna's characters dated on "7th Heaven," and the two were together for three years in real life.
Real-life romance brewed on the "Dawson's Creek" set between Katie Holmes and Joshua Jackson.
Scott Foley and Jennifer Garner dated and later married after meeting on the set of "Felicity." They initiated their divorce in 2003.
Sean Penn and Susan Sarandon fell head-over-heels while working together on "Dead Man Walking" in the mid-1990s.
They were hot and heavy in "Felicity," and Scott Speedman and Keri Russell were feelin' it in real life, too. (Keri is now with her "The Americans" co-star Matthew Rhys!)
The "One Tree Hill" drama kept going after the director called "cut." Chad Michael Murray and Sophia Bush married in 2005 and divorced five months later.
Jessica Alba has since revealed that she lost her virginity to her 'Dark Angel' co-star and then-fiance Michael Weatherly.
"Freaks and Geeks" co-stars Jason Segel and Lisa Cardellini dated in real life throughout the show.
After co-starring in "Alias," Jennifer Garner and Michael Vartan dated for about a year.
Their "Entourage" fling was supposed to be a joke, but Jamie-Lynn Sigler and Jerry Ferrara ended up crushing on each other once the cameras stopped rolling.
Recognize this baby-faced version of Chris Pratt? He and Emily VanCamp dated while playing brother and sister on "Everwood."
Vanessa Hudgens briefly dated her "Journey 2: The Mysterious Island" co-star Josh Hutcherson after her split from Zac Efron.
Milo Ventimiglia and Hayden Panettiere got cozy after getting to know each other on set of "Heroes."
"Big Bang Theory" fans had no idea that Kaley Cuoco and Johnny Galecki were together in real life until after they announced their breakup in 2010.
"Abduction" co-stars Lily Collins and Taylor Lautner had a short-lived romance after shooting the 2011 flick.
Maggie Grace and Ian Somerhalder dated for a year during their time on "Lost."
Their "Entourage" fling was supposed to be a joke, but Jamie-Lynn Sigler and Jerry Ferrara ended up crushing on each other once the cameras stopped rolling.
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