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Guess who? Demi Lovato unveils an amazing photo 'stache on Twitter. Plus, more from Jennifer Aniston, Kanye West and other stars

  •  photo | Demi Lovato, Simon Cowell

Credit: Inset: Pacific Coast News

Updated: Friday Jun 14, 2013 | 06:00 AM EDT By: Karen J. Quan

"I can't..... Umm... Care to explain @SimonCowell???"
Demi Lovato, posting an old-school photo of her fellow X Factor judge, on Twitter