Usually going on talk shows is a pleasant experience for celebrities.  They get to plug their latest project, and the welcome baskets in their green rooms are the best.  But this past week, Paris Hilton had an experience at the Late Show that she’d love to forget.

Last Friday, the heiress made a scheduled appearance on the Late Show with David Letterman to promote her new fragrance Can Can and upcoming movie “Repo! The Genetic Opera.” But Dave had other plans.

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