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Sources have claimed that the Simple Life star will appear in the fifth episode of season five, although her character and storyline are being kept under wraps.
A show insider added: "The fans should trust [creator] Eric Kripke."
Hilton previously starred alongside Jared Padalecki (Sam Winchester) in 2005 horror film House Of Wax.
The fifth season of Supernatural premieres on The CW in September.
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