Photo SpecialStars In Masks!

Who's that pig? See Keira Knightley and other stars (Britney! Celine!) wearing wacky masks

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CELINE DION

Feeling under the weather while Down Under, the songstress wasn't taking any during her 2008 Taking Chances world tour.

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Credit: Newspix/REX USA; Landov (inset)

Updated: Thursday Apr 10, 2008 | 06:00 AM EDT

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