We love that Ariana is breaking out and showing off some cutesy dance moves, but we're not so sure Rihanna was impressed. Don't believe us? Check her out around 3:05, where Ariana's sultry moves give Rihanna a case of the giggles.
Ariana also picked up the iHeartRadio Music Young Influencer award and was so overwhelmed by Hilary Duff presenting it to her, she could barely give her speech!
What did you think of Ari's performance?
Ariana Grande performs ~ iHeartRadio Music Awards by HumanSlinky
Gallery | iHeartRadio Awards Show Red Carpet Arrivals