Paris Hilton and Nicole Richie, The Simple Life

After filming their third season of their popular Fox show, the BFFs had a falling out, and Hilton went so far as to publicly proclaim that socialite Kimberly Stewart would replace Richie in the next installment. The on-again, off-again duo ended up filming two more seasons. In one, the heiresses never shared screen time, but in the final season, they reunited and worked as summer camp counselors.