"We knew it!"
That is what every Ross and Rachel fan screamed (in their best Chandler voice) when David Schwimmer and Jennifer Aniston admitted to having crushes on each other early on in Friends' run. For a shipper, there is no greater satisfaction than learning that the actors playing your favorite couple have just as much chemistry in real-life. But sometimes, like with Schwimmer and Aniston's revelation, you don't actually learn about their relationship until years later.
The Friends' lobsters pair are far from the only co-stars to secretly harbor feelings for each other while working together. Several hookups were going down on the set of Saved By the Bell, while an iconic couple from Beverly Hills, 90210 were in a relationship even more on and off then their characters. Plus, Miley Cyrus dated one of her movie co-stars with no one knowing and The Big Bang Theory fans' minds were blown when it was revealed two of the show's stars had dated for several years.
So which co-stars took their romance off-screen with fans never knowing? You're definitely going to want to rewatch some of these TV shows to look for clues after finding out about all of the IRL hookups...