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!
Paris Hilton and Kim Kardashian
Hilton flew into a rage at a Las Vegas club in August 2010 when her childhood pal and protegee ignored and publicly mocked the heiress. "Paris is upset at Kim — but it's 100 percent jealousy," a source tells Us of Hilton. "Kim is not only doing what Paris did, she's doing it better."