7. Leonardo DiCaprio & Claire Danes
"Romeo, Romeo, wherefore art thou Romeo." In the '90s reboot of Romeo and Juliet, Claire Danes was not impressed with Leonardo DiCaprio. She called their on-screen romance, "immature." The two only were together when the cameras were rolling.
This "dislike" for Leo might have been because she secretly had a crush on him that she admitted years later.
8. James Franco & Anne Hathaway
You might remember when these two hosted the 2011 Oscars together, and it ended up being a total flop. After they received criticism, they went on to blame each other for the failed performance.
James Franco was on Howard Stern's radio show and they both bashed her for being too affected and "actress-y."
9. Blake Lively & Leighton Meester
Spotted: S and B are fighting again. These besties have been through so much together, but it looks like S is stuck in her own world. Will B be able to forgive her? XOXO Gossip Girl. The Gossip Girl co-stars spent years filming together, and after the show ended, they stopped speaking.
Leighton Meester was upset that Blake Lively didn't reach out to congratulate her on her engagement to Adam Brody.
10. America Ferrera & Lindsay Lohan
Way back in 2008, Lindsay Lohan guest-starred on America Ferrera's show, Ugly Betty. While on set, Lohan caused tension because she acted like a diva and wouldn't listen to people. Also, she tried to upstage Ferrera.
Due to her bad behavior, Lohan's episodes were cut from six to four. She blamed the production for all her problems.
11. Shannen Doherty & Jennie Garth
Brenda and Kelly from Beverly Hills, 90210 were actually not friends in real life. They both blame it on being young and finding their way in the world.
Jennie Garth also said that they butted heads because they were both strong, independent women with big personalities.
12. Gillian Anderson & David Duchovny
While filming The X-Files, Gillian Anderson and David Duchovny could not stand each other. They spent too much time on set together to the point where they would argue about nothing.
Anderson and Duchovny eventually worked out their arguments, and they are friends. Not all feuds last forever.