Some affairs turned into relationships...

These Celebrities Cheated With Their Co-Star

Sometimes on-screen chemistry turns into chemistry in real life. Some actors and actresses get cast for a role with a love interest and that can take a real toll on their real-life relationships... See which celebs cheated on their significant others with their co-stars in the video above...

Relationships are tough in Hollywood and these cheating scandals only strengthen that theory even more. For some affairs, they turned into long-lasting marriages like Daniel Craig and Rachel Weisz falling in love on the set of Dream House. Other relationships fall apart like Reese Witherspoon's marriage to Ryan Phillippe when he had an affair with Abby Cornish on the set of Stop-Loss. Check out the video above for more...