Besides being Mrs. Pratt, Heidi may have another new role in the works: Playboy Playmate! Life & Style can exclusively reveal that Heidi's in negotiations to pose for magazine. "She wants to do it," the insider confirms. "It's just a matter of working out the details." The insider tells Life & Style that Spencer is encouraging her to do it and is working on negotiating a $500,000 deal for his wife.

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