On-set romances are a natural side effect of making a movie. When actors spend months together in close quarters, it’s only a matter of time before they begin practicing their kissing scene a little bit longer and, before you know it, the two of them are gushing to Ryan Seacrest together about how in love they are.
Of course, it doesn't always happen like that. Sometimes fans and tabloids try to create a relationship out of thin air (i.e. - Robert Pattinson and Kristen Stewart were seen at a dinner together with 20 other people? Gasp! It must be love!). And sometimes costars do hook up on movie sets, but they don't always get their happily ever after. To prove it, we're counting down the Top 10 on-set romances.