1. Selena Gomez and Miley Cyrus both dated Nick Jonas
Our favorite former teen stars seemed to have formed a little rivalry during the height of their Disney careers all because of the third youngest Jonas Brother. Shortly after ending things with Miley Cyrus, Nick Jonas went after Selena Gomez and that pretty much started the small feud between the two female stars.
2. Katy Perry and Taylor Swift both dated John Mayer
Having a common beau allegedly started the "Bad Blood" between Katy Perry and Taylor Swift. Although there was never a direct confirmation from Taylor's side, the fans like to think that her song "Dear John" pretty much speaks for itself. Katy and John, on the other hand, dated on and off for almost two years before officially breaking up last year.
3. Hilary Duff and Lindsay Lohan both dated Aaron Carter
The original Disney Queens had their own share of teenage drama when Aaron Carter decided to break up with Hillary Duff and chase after Lindsay Lohan instead. Aaron and Lindsay's relationship may be short-lived but it created enough friction for the trio. This love triangle started the long and unfortunate rivalry between the Mean Girl lead actress and the Lizzie McGuire star.
4. Zac Efron and Taylor Lautner both dated Lily Collins
Taylor Lautner and Lily Collins met at the set of Abduction in 2011. The two co-stars dated for a while before deciding to call it quits a week before the premiere of their movie. Lily met Zac Efron a year later and their sweet paparazzi photos immediately sparked dating rumors. The two never confirmed anything but sources claimed that the couple dated for several months back in 2012.
5. Gigi Hadid and Taylor Swift both dated Joe Jonas
Joe and Taylor's relationship might have ended in bad terms but the popular country singer gracefully accepted Gigi and Joe's romance last year. Taylor was totally cool about her best friend dating her ex that she even posted an Instagram photo with the former couple. These two best friends just proved that nothing can come between their strong friendship.