1/9
The Owyoungs for iHeartRadio
Ariana Grande
The "Side to Side" songstress performed some of her biggest hits at the Las Vegas concert.
2/9
The Owyoungs for iHeartRadio
Maddie Ziegler
Sia's favorite dancer once again stole the show.
3/9
Mike Windle/Getty Images for iHeartRadio
DNCE
"Toothbrush" singers pose on the red carpet.
4/9
The Owyoungs for iHeartRadio
Backstreet Boys
Fresh off their exciting Las Vegas residency announcement, the men of BSB stole the show with an awesome performance.
5/9
Mike Windle/Getty Images for iHeartRadio
Justin Baldoni
Hello, Rafael! The Jane the Virgin star looked as handsome as ever.
6/9
Mike Windle/Getty Images for iHeartRadio
Billy Idol
The "White Wedding" crooner was seen before taking the stage with Miley Cyrus.
7/9
The Owyoungs for iHeartRadio
Pitbull
The "Greenlight" artist brought the crowd to its feet.
8/9
The Owyoungs for iHeartRadio
Sia
Donning her signature wig, Sia concealed her face from the audience.
9/9
The Owyoungs for iHeartRadio
T-Mobile Arena
The iHeartRadio Music Festival's venue was filled to capacity.