Famous Feuds: 20 Superstars Who Loathe Each Other

When a non-famous person hates someone, we gossip behind their backs and and unfollow them on Facebook. But when celebs hate each other? There are press releases involved, highly publicized Twitter wars, and bitchy headlines. Some, like Madonna and Gwyneth Paltrow, started off as friends; others, like Nikki Minaj and Mariah Carey, were co-workers. And then there are those, like Katie Couric and Kim Kardashian, who just seem to enjoy taking jabs at each other in public. Here are the feuding stars that do it the best:

rihannateyana

kellychristina

kanyejustin

poehlerswift

mariahnicki

madonnagwyneth

nenestar

chelseajoan

jayharry

katiekim

[Photos: Getty Images]