The iHeartRadio Music Festival kicked off at the MGM Grand in Las Vegas on Friday and brought out some of music's biggest names over the weekend. Nick Jonas [1] and Jennifer Lopez [2] took the stage on Saturday, while Kanye West [3] ran through 18 of his greatest hits [4] on Friday. On top of the epic performances, stars like Joe Jonas [5], Taylor Lautner [6], and famous duo Demi Lovato and Wilmer Valderrama [7] gathered backstage for some fun pictures throughout the weekend. Scroll through for all the must-see snaps of the stars, and stay tuned for more action from the three-day festival!

Jennifer Lopez

Blake Shelton

Taylor Lautner and Tori Kelly

Darren Criss and Hailee Steinfeld

Joe Jonas

Tove Lo and Nick Jonas

The Weeknd

Jennifer Lopez and Ryan Seacrest

Rita Ora

The Weeknd and Diddy

Jennifer Lopez and Casper Smart

Diddy and Mase

Lil' Kim

Big Sean

Kanye West

Ryan Seacrest and Jared Leto

Joe Jonas and Josh Hutcherson

Chris Martin

Kanye West and Jared Leto

Ashley Tisdale and Christopher French

Lil Wayne and Diddy

Taylor Lautner and Wilmer Valderrama

Joe Jonas and Nick Jonas

Sam Smith

Nick Jonas