In addition to dueting with artists like Kellie Pickler and Kayleigh Bannen, who also performed at the event, Underwood invited surprise guest Miranda Lambert onstage.

The two sang a duet of "Somethin' Bad," Lambert's 2014 song featuring Underwood. Even though both women were up for Female Vocalist of the Year (a title Lambert would go on to win for the seventh year in a row) that didn't get in their way of having a damn good time. Strutting back and forth onstage, and belting out big notes, they celebrated each other with a tune that got the crowd screaming. Check out the duet - here.

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