2015 iHeartRadio Music Festival | Entertainment News, Photos, and Videos

The Weeknd hits the stage for his set during the 2015 iHeartRadio Music Festival held at MGM Grand Garden Arena on Saturday (September 19) in Las Vegas.

The 25-year-old entertainer was joined at the event by Big Sean, Prince Royce, Trey Songz, Tyga, Sean “Diddy” Combs, Blake Shelton, and Fall Out Boy.

PHOTOS: Check out the latest pics of The Weeknd

Earlier in the day, both Sean and Trey hit the stage for the Daytime Village as well.

FYI: The Weeknd is wearing a Levi’s trucker jacket.

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Hailee Steinfeld hits the stage with Shawn Mendes at the 2015 iHeartRadio Music Festival at MGM Grand Garden Arena on Saturday (September 19) in Las Vegas.

The duo sang Shawn‘s hit song “Stitches” for the crowd. Watch the video below!

PHOTOS: Check out the latest pics of Hailee Steinfeld

Also at the event that day during The Daytime Village were Tori Kelly, Echosmith, Tove Lo, The Struts, Madison Beer, Hozier, George Ezra, and Jack & Jack.

45+ pictures inside of Hailee Steinfeld, Shawn Mendes, and more at the festival…More Here! »

Demi Lovato is all about the mesh as she performs at The Daytime Village during the 2015 iHeartRadio Music Festival at the Las Vegas Village on Saturday (September 19) in Las Vegas.

The 23-year-old “Cool for the Summer” singer was joined by Nick Jonas, Joe Jonas (who performed with his new band DNCE), and Demi‘s boyfriend Wilmer Valderrama.

Meanwhile, Taylor Lautner, Nat Wolff, Kat Graham, and Ashley Benson all hit the stage to present different performers that day.

FYI: Ashley is wearing Kurt Geiger London shoes and Jennifer Meyer jewelry. Her hair was styled using Matrix StyleLink products. Wilmer is wearing AllSaints.

45+ pictures inside of Demi Lovato, Nick Jonas, and more performing in Vegas…More Here! »

Matt Bomer poses backstage while attending the 2015 iHeartRadio Music Festival on Saturday (September 19) at the MGM Grand Garden Arena in Las Vegas.

Also in attendance at the event were Jennifer Lopez (who also performed during the concert), musician James Bay, and The CW’s Crazy Ex-Girlfriend star Rachel Bloom.

Matt is starring on the upcoming series American Horror Story: Hotel and his co-star Cheyenne Jackson recently marveled over his super hot looks.

“Matt looks like he’s carved out of cream cheese. He’s just so perfect and smooth and gorgeous,” he told Out magazine. “We were in hair and makeup one time, sitting side by side, and I was like, ‘Are you kidding me with that face?’”

FYI: J.Lo is wearing an Altuzarra jacket, House of CB jumpsuit, and Jimmy Choo shoes.

Jennifer Lopez hits the stage to perform at the 2015 iHeartRadio Music Festival on Saturday night (September 19) at the MGM Grand Garden Arena in Las Vegas.

The 46-year-old entertainer made a special announcement at the event and it was very fitting as it had to do with her Vegas residency starting in January.

Jennifer announced that the residency will be called All I Have and she also unveiled the artwork for the show.

The residency begins on January 20 at the AXIS theater stage in Planet Hollywood Resort & Casino. Tickets are on sale now at jlovegas.com!

FYI: J.Lo is wearing a Michael Costello jumpsuit with Topshop shoes.

Ashley Tisdale keeps close to husband Christopher French as they arrive at the 2015 iHeartRadio Music Festival held at MGM Grand Garden Arena on Friday night (September 18) in Las Vegas.

The 30-year-old actress joined social star brothers Nash and Hayes Grier, Taylor Lautner and Josh Hutcherson.

“Caught up with @wilmervalderrama on our way to @iheartradio. Las Vegas here we come!!!” Ashley captioned on Instagram en route to Vegas.

Nash is also pictured picking up Hayes from Dancing With The Stars practice earlier in the afternoon.

FYI: Hayes is wearing a Scott Langton shirt.

30+ pictures inside of Ashley Tisdale, Christopher French and more…More Here! »

Jason Derulo strips off his shirt on stage while performing at the 2015 iHeartRadio Music Festival held at MGM Grand Garden Arena on Friday night (September 18) in Las Vegas.

The 26-year-old singer, who just celebrated his birthday earlier in the week, hit the stage with Demi Lovato, Sam Smith and duo Disclosure.

PHOTOS: Check out the latest pics of Demi Lovato

“Morning VEGAS. Don’t worry I am excited to be here – that’s just my ‘Jetlag is a b****’ face,” Sam wrote on Instagram just hours before hitting the stage.

25+ pictures inside of Demi Lovato, Sam Smith and Jason Derulo…More Here! »