PHOTOS: The iHeartRadio Music Festival as You've Never Seen It Before
We gather he's making quite a few girls jealous with his performance Saturday night at the MGM Grand Garden Arena in Las Vegas.
We can't go without hearing his crazy-catchy tunes, as festivalgoers did on Saturday.
Only the rapper could be in two places at once.
Smith overcomes his serious jet lag to turn it out on Friday night.
WALK THE MOON
An easy way to get someone to shut up and dance with you (perhaps): stick an apple in his or her mouth.
The group's frontman Chris Martin leads the charge to the MGM Grand Garden Arena stage.
The rising stars are dressed appropriately – in stars, that is! – backstage at the fest.
No velvet ropes needed when you're flying solo like the Irish artist.
J. Lo gets down (literally!) with the fans during her set.
The Detroit-born rapper represents his hometown during his stint in Vegas.
Hey, someone had to bring a little country to Sin City!
Because it wouldn't be Vegas without some showgirls.
Fresh off PEOPLE's Ones to Watch party, the up-and-comer scores some alone time ahead of her iHeart set.
FALL OUT BOY
The guys show us the reality of music festivals – trailers! – before hitting the stage.
It's all about the atmosphere, baby.
On hand to perform her new single "Love Myself," the teen star looks all grown up.