X-Tina & Nicole -- Mamas' Night Out!

Nicole Richie and Christina Aguilera aren't like regular moms, they're cool moms -- and last night, they went clubbin' together.


The maternal duo was spotted coming out of Hollywood hotspot Voyeur on Thursday, where they partied until 1AM. (Watch Christina's new music video!)

Their babydaddies stayed home ... someone's gotta watch the kids!

Ashton Kutcher & Mila Kunis:
Baby On The Way? -- Celebuzz

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