PHOTOS: The iHeartRadio Music Festival as You've Never Seen It Before

What happened in Vegas this weekend definitely didn't stay there

01 of 17

NICK JONAS

NICK JONAS
Joseph Llanes

We gather he's making quite a few girls jealous with his performance Saturday night at the MGM Grand Garden Arena in Las Vegas.

02 of 17

THE WEEKND

THE WEEKND
Joseph Llanes

We can't go without hearing his crazy-catchy tunes, as festivalgoers did on Saturday.

03 of 17

DEMI LOVATO

DEMI LOVATO
Joseph Llanes

After spending time with boyfriend Wilmer Valderamma and pup Batman, the singer gets down to some sexy business backstage.

04 of 17

KANYE WEST

KANYE WEST
Joseph Llanes

Only the rapper could be in two places at once.

05 of 17

SAM SMITH

SAM SMITH
Joseph Llanes

Smith overcomes his serious jet lag to turn it out on Friday night.

06 of 17

WALK THE MOON

WALK THE MOON
Joseph Llanes

An easy way to get someone to shut up and dance with you (perhaps): stick an apple in his or her mouth.

07 of 17

COLDPLAY

COLDPLAY
Joseph Llanes

The group's frontman Chris Martin leads the charge to the MGM Grand Garden Arena stage.

08 of 17

ECHOSMITH

ECHOSMITH
Joseph Llanes

The rising stars are dressed appropriately – in stars, that is! – backstage at the fest.

09 of 17

HOZIER

HOZIER
Joseph Llanes

No velvet ropes needed when you're flying solo like the Irish artist.

10 of 17

JENNIFER LOPEZ

JENNIFER LOPEZ
Joseph Llanes

J. Lo gets down (literally!) with the fans during her set.

11 of 17

BIG SEAN

BIG SEAN
Joseph Llanes

The Detroit-born rapper represents his hometown during his stint in Vegas.

12 of 17

KENNY CHESNEY

KENNY CHESNEY
Joseph Llanes

Hey, someone had to bring a little country to Sin City!

13 of 17

THE KILLERS

THE KILLERS
Joseph Llanes

Because it wouldn't be Vegas without some showgirls.

14 of 17

TORI KELLY

TORI KELLY
Joseph Llanes

Fresh off PEOPLE's Ones to Watch party, the up-and-comer scores some alone time ahead of her iHeart set.

15 of 17

FALL OUT BOY

FALL OUT BOY
Joseph Llanes

The guys show us the reality of music festivals – trailers! – before hitting the stage.

16 of 17

DIDDY

DIDDY
Joseph Llanes

It's all about the atmosphere, baby.

17 of 17

HAILEE STEINFELD

HAILEE STEINFELD
Joseph Llanes

On hand to perform her new single "Love Myself," the teen star looks all grown up.

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