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Rihanna and … Jennifer Nettles? Carrie Underwood and … Steven Tyler?

Not exactly tandems you might expect to perform together, but both duos held their own and then some at the Academy of Country Music Awards.

Here’s Rihanna and Jennifer Nettles of Sugarland fame, rocking “California King Bed” before a packed house at the 46th annual industry gala in Vegas …

Rihanna & Jennifer Nettles - California King Bed

Follow the jump for Carrie and Steven – American Idol stars past and present – performing a medley of “Undo it” and “Walk This Way” at the event.

They actually sounded pretty good together …