If you think about it, famous relationships are pretty deceiving. Since we're so used to seeing celebrities look perfect in public, it's easy to assume that their romance is all sunshine and roses. However, stars like Joe Jonas and Liam Hemsworth have proved that this isn't always the case, and they even went as far as reportedly cheating on their partners with other stars. Yikes!
Click through the gallery to see which stars have been accused of cheating on their famous partners with another celebrity!
Fans suspected that Ed's hit song "Don't" was all about Ellie cheating on him with Niall, which he hinted at during an interview.
"What happened was one of the newspapers in England just printed that it was confirmed when it never was. We got in touch, and they took the story down. But obviously the damage had already been done by that point because every other newspaper picked up on it. So I never actually confirmed it," he said.