Christina Aguilera to Guest Judge on Project Runway

The teaser for this week's Project Runway outlined a Bob Mackie-inspired challenge, leading the blogosphere to think they'd get Cher on as a guest judge.  But lo and behold, it's Christina Aguilera!

Known as much for her theatrical getups as for her voice - much like Cher, we might add - X-tina adds a little spice to what's sure to be a wild and crazy, Bob Mackie-fest challenge on Runway.

Boys and girls, this is going to be a good one. 

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