Britney Spears' comeback is in full effect. At the Billboard Music Awards on Sunday night (May 17), the veteran pop darling brought Iggy Azalea along for the ride to perform their new collaboration "Pretty Girls."

Surrounded by squad of dancers and a couple of crafty folks on skates, Spears took the Billboard audience to the future. She donned a black patent leather cut-out catsuit, which showed off her slim frame. It's clear that the singer hasn't lost a step when it comes to her physique.

"Hey, don't you know that it's always the same?" she taunted. "From Australia 'round to L.A. / You can betcha wherever the girls go, boys follow." Unfortunately, it was obvious she was lip-syncing throughout the performance, but at least she kept the energy going while skipping around for a few beats.

Azalea kept to her side of the stage for the most part, flinging her new pink-tipped bob as she rapped, "If you ask me, I'm killing them softly / I would spend time with you but that'd cost me." These pretty girls may be easy on the eyes, but they're pretty tough too.

See Your Favorite Rappers & Singers on the Red Carpet at 2015 Billboard Music Awards