Demi Lovato's slumber party to Kim Kardashian's hot-pink retainer, see how the stars get ready for zzz's in their Twitter pics!
Credit: Courtesy Katy Perry
Updated: Tuesday Oct 12, 2010 | 06:00 AM EDT
By: Cara Lynn Shultz
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The singer celebrated her album Teenage Dream topping the charts with "my new South Park pj's" – and an adult beverage! – on her tour bus.
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