Stephanie Pratt, Spencer’s sister, had a little talk yesterday with Ryan Seacrest on KIIS-FM.  Wow, Seacrest must really be hard-up for celebrity guests if he’s interviewing a douchebag from a reality show’s sister!

Anyway, Stephanie lamented that if Heidi Montag ever cheats on her brother, “I’d kill her!”  So, obviously you don’t mess with the Spence and get away with it! Sissy’s been to jail before and she will f*** you up!

Photo: E!Online

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