• CHRISTINA VS. MARIAH photo | Christina Aguilera, Mariah Carey

Credit: Tony DiMaio/Startraks; Fox/Getty

Published: Wednesday September 25, 2013 06:00 AM EDT



First come the matching outfits – flirty pink Alaïa minis and major heels – then comes the album of duets and subsequent world tour. That's how it works, right? Yes? Please?

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