Paris Hilton has had better weeks: The socialite, who was arrested on drug charges in Las Vegas Friday night, is now the late night punch line of the week as well, as David Letterman joked about her recent misfortunes on The Late Show Wednesday.

"Does she need any more trouble, does she really?" Letterman joked, referencing Hilton's stint in jail in 2007. "By the way, whatever happened to  'what happens in Vegas stays in Vegas?'"

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