Kate Upton Sizzles in Burger Ad ([WATCH)

Sports Illustrated cover girl Kate Upton gets up close and personal with a charbroiled beef patty in a new commercial for Carl's Jr. and Hardee's, a fast-food chain known for using sexy women to sell burgers. Upton follows in the footsteps of some other sizzlers who appeared in the chain's ads, including Kim Kardashian, Paris Hilton and Padma Lakshmi. 

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 Watch Upton bite into the new jalapeño-laced Southwest Patty Melt :