It's a short path from frenemy to foe for the stars of "The Real Housewives of Beverly Hills." In a new teaser for the upcoming RHOBH reunion, Kathy Hilton calls Lisa Rinna the “biggest bully in Hollywood.” Fans watched the feud take form after a bad night in Aspen, and things have only gotten worse since. Lisa claims Kathy had a “psychotic break," and the incident has caused a rift between Kathy and her sister, Kyle Richards. So is Lisa to blame for stirring the pot and tearing these two sisters apart? And will we see them mend their relationship next season?

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