Cher vs. Christina Who'd You Rather?

11/16/2010 4:03 PM PST

Cher vs. Christina: Who'd You Rather?

Living, breathing pop icon Cher, 64, and incessant platinum blonde diva Christina Aguilera, 29, both kept a straight face at the premiere of their new film Showgirls 2 "Burlesque" in L.A. on Monday.

Question is ...