Ariana Grande took to the iHeartRadio stage to sing Jessie J's high notes for 'Bang Bang' with Nicki Minaj...when things got sexy.
Check out the ladies bump and grind their way across the stage at this weekend's Las Vegas concert above!
But TheFIX think this booty-thrusting display has nothing on JLo and Iggy Azalea's new clip for the aptly titled 'Booty'. Watch that below...
iHeartRadio kicked off on Friday night in the US with performances from Taylor Swift, Mötley Crue and Chris Brown.
View slideshow: Can you guess the celebrity butt?