Some stars cannot be best friends forever. Find out why these former celebrity BFFs are no longer pals, including Kim Kardashian and Paris Hilton's disintegration of friendship due to jealousy issues, Jill Zarin and Bethenny Frankel's nasty falling out on reality TV, and more!
Madonna and Gwyneth Paltrow
Though they've been friends since 1999, a source close to both stars claimed the women had a major falling out in June 2010. "They don't speak," the insider told Us. "I can't tell you exactly why they had the falling out, but Gwyneth can be jealous and competitive."