Lovely!!!

That's the word we'd use to describe Ariana Grande's performance at the 2014 iHeartRadio Music Festival!!!

The 21-year-old singer performed some of her biggest hits including Problem, The Way, Break Free, Break Your Heart Right Back, and Be My Baby and she nailed each and every one of them!

And her set had the entire crowd at the MGM Grand Garden Arena in Las Vegas on Friday night rocking!!!

You might want to groove along to the tunes, too, if you watch Ariana's set down (below) !!!

You go, girl!!!!