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You know when you're watching a movie or TV show and the chemistry between the on-screen couple is simply undeniable? That's because sometimes their relationship may not be an act at all — they just may be a couple in real life (or a soon-to-be couple, at least). 

These couples certainly mixed business with pleasure, and we're in full support of it. Though, we imagine things got pretty awkward for the couples that broke up but had to continue working together. (We're looking at you Chad Michael Murray and Sophia Bush.) 

Some of these couples (or former couples) are common knowledge, like Channing Tatum and Jenna Dewan, or Miley Cyrus and Liam Hemsworth. But do you remember couples like Zac Efron and Vanessa Hudgens, or Blake Lively and Penn Badgley? They were young love at its finest. If you didn't remember, then you're in for a treat, because we're going to take you down memory lane to look back at all the couples who took their chemistry off-screen. 

Keep reading to see all the on-screen couples that dated in real life.