Billboard Music Awards: Britney Spears and Iggy Azalea Perform "Pretty Girls" For First Time on TV (Video)

The duo like, totally brought their music video to life.

Britney Spears and Iggy Azalea like, totally brought their '80s Valley girl music video for "Pretty Girls" to life at the Billboard Music Awards Sunday night.

The two stars invaded Planet Hollywood's Axis Theater, where Spears headlines her Britney: Piece of Me show, to perform their new single for the first time on TV.

The colorful, dance-heavy performance also played up the video's alien-invasion concept, with the two stars appearing in a beam of light in the center of the stage.

Spears wore a skimpy black bodysuit that was mostly sheer apart from some strategically placed shapes.

Azalea, in keeping with her role as an alien in the video, wore a short silver dress with knee-high boots.

Accompanied by a bunch of male dancers wearing very '80s attire, Spears and Azalea performed in front of flashing pink, green and blue lights.

Azalea went into Sunday night's show up for 12 Billboard Music Awards. Before her performance with Spears aired, the Australian rapper had already taken home the Billboard Music Award for top rap song for her "Fancy" collaboration with Charli XCX, one of her two nominations in that category.

The Billboard Music Awards, co-hosted by Ludacris and Chrissy Teigen, aired live from the MGM Grand Garden Arena in Las Vegas on ABC at 8 p.m. ET.

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