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 Nicole Richie
Though neither Simple Life star publicly addressed the reason for their rift in 2005 (it was reported that Richie showed one of Hilton's sex tapes to a group of friends at a party), the two reconciled the following year.
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