The Backstreet Boys
Only at the iHeartRadio Festival will you see a collaboration with the '90s boy band and Florida Georgia Line.
Ariana Grande
We love the way this "Dangerous Woman" singer performed on Night Two of the festival.
John Stamos, Taylor Lautner & Sting
"Police Reunion 2017. #DontStandSoCloseToUs #iheartradio," John wrote on Instagram after the surprise meeting.
Ben Higgins, Luaren Bushnell & Laurie Hernandez
While celebrating their one-year anniversary, The Bachelor stars meet one of their favorite Team USA athletes.
Britney Spears
Whether dancing to Mary J. Blige or bringing out G-Eazy, the "Circus" singer's performance was pretty hot.
Lea Michele & Brad Goreski
When not dancing to Ariana Grande or Britney Spears, the BFFs pose for photos backstage at the T-Mobile Arena before getting dinner at Beauty & Essex in The Cosmopolitan.
Usher
After making an appearance at the Global Citizens Festival in New York City, the "Yeah!" singer arrives in Las Vegas to perform for a sold-out crowd.
Wilmer Valderrama & Ashley Iaconetti
The Bachelor in Paradise star can't help but smile while posing next to the Hollywood actor.
Tinashe
What better way to celebrate a performance than with Jiff!?
Idina Menzel
In addition to showing off her $30,000 engagement ring, the Broadway superstar also wore a stunning pair of Simon G. Jewelry earrings to complete her sparkly look.
Miley Cyrus & Billy Idol
Surprise! The Voice coach appears onstage with the rocker for an unexpected performance.
John Stamos & Taylor Lautner
Before introducing Britney Spears to the stage, the Scream Queens stars have some fun backstage.
Laurie Hernandez, Val Chmerkovskiy, Sharna Burgess & James Hinchcliffe
Everybody stops for Jiff, especially the Dancing With the Stars family.
Jamie Foxx & Don Cheadle
It's family night at the T-Mobile Arena for Hollywood's biggest stars.
Drake
Oh what a night! The rapper delivers an electric set on night one of the iHeartRadio Music Festival.
Sam Hunt
From rock 'n' roll to country music, there's something for everyone at this festival.
JoJo Fletcher & Brad Goreski
In between dancing to Sam Hunt, the Fashion Police co-host meets up with the happily engaged JoJo.
Taylor Lautner, Sharna Burgess & James Hinchcliffe
Team Jacob? This Dancing With the Stars pair sure is!
Chris Soules, Wells Adams, Chase Mcnary & Robby Hayes
The boys of The Bachelorette are back in Las Vegas for the iHeartRadio Festival.
JoJo Fletcher & David Spade
You just never know who you're going to meet at the iHeartRadio Music Festival.
Haley Ferguson, Emily Ferguson & Ashley Iaconetti
The Bachelor in Paradise stars reunite at the T-Mobile Arena in Las Vegas.
NEXT GALLERY: Singers Performing Live