See All the Hottest Looks On and Off the Stage at the iHeartRadio Festival

A few years ago, you had never even heard of this iHeartRadio event. Now? It's one of the biggest weekends in music! Check out the wild looks A-listers rocked at the festival.

Just when she can't shock us any more, Miley Cyrus takes eye-popping to the next level with tiny black pasties.

Oh, hello Adam Levine's beautiful torso. No one makes a mic stand look hotter than this judge from The Voice.

Las Vegas' newest showgirl Britney Spears made an appearance, as did her bra.

Paul McCartney lent some major star power to the proceedings.

Jared Leto and his band Thirty Seconds to Mars have the best hair in rock and roll.

Singer Kat Graham hit the festival with her Vampire Diaries co-stars.

Yes, Danity Kane is definitely back together! They performed for the first time since they hinted at a reunion at the VMAs.

What's a big show without Justin Timberlake? Well, boring, that's for sure!

Drake performed wearing a shirt with Jaden Smith's face on it. What's the deal? It's reportedly the image from the VMAs of Jaden's adoring reaction to Drake's performance. Cute!

Tim McGraw made a solid bid for vests to become hot again with his performance.

Ke$ha took shots of whiskey during her performance and even sang a duet with Joan Jett.

Cheeky Brit Cher Lloyd wore a typical loud and fun ensemble.

Not satisfied with her tiny pasties look, Miley hit the stage again in a slight white outfit (with a rainbow on stage!).

Dance group Krewella had the crowd moving nonstop.

What's a music event without a boy band? The Wanted brought their good looks and awesome voices to the stage.

Ryan Seacrest, as usual, is everywhere at all times. He hit the Emmys red carpet the next day.

Twilight star Jackson Rathbone kept it vampire-dark in black and white.

P.Diddy seemed a bit dressed up for the occasion, but we will never fault a suit and tie (right, Justin and Jay Z?).

Ashley Greene wore an intricate black dress with slightly lighter hair.

Avril Lavigne has yet to give up that punky girl style—but she basically reinvented the look, so we'll give her a pass.

Ne-Yo wore a somewhat strange grandpa-on-a-cruise get-up. Cute hat, though!

Check out Zedd, the big producer and DJ behind summer's ubiquitous hit "Clarity."

Just try looking at a pic of Bruno Mares and not smiling. You're smiling right now, aren't you!

The Kardashians koordinated in loads of black leather.

Miguel got the black leather memo in a cool jacket we need to borrow right now!

All hail Kelly Rowland! The X Factor judge killed it in thigh-high leather boots.

Um, are we seeing a trend? Jason Derulo wore the black leather uniform.

Surely you've seen the foxes viral video by now? If not, stop what you're doing and google "what does the fox say" right now!

Kate Hudson never ages. She kept the cool-rocker feel going in yet more black and leather.

Robin Thicke had a few wardrobe issues—his bottom button popped off during the performance!

Keith Urban has the best colorist in Hollywood. Check out those golden highlights.

Kate Hudson's man Matt Bellamy and his band Muse gave an awesome performance.

Could we be more excited for TLC's new music and TV movie? No, we could not.

Benny Benassi is a super cool Italian DJ whom you may remember from that highly digital dance hit "Satisfaction" circa 2003.

Elton John was everywhere this weekend! Prior to his Emmys performance, he hit the iHeartRadio stage as well.

Chris Brown—making fedoras happen.

Katy Perry played a bunch of her #1 hits. Let's never forget how many of those she really has!

Feeling chilly, boys? The dudes of fun. stayed cozy in fall jackets.

Adam Lambert wears heels on stage, while most us can't walk a block in them. Amen!

Lucy Hale and Shay Mitchell of Pretty Little Liars keep the beauty industry afloat with their awe-inspiring hair.

Colton Haynes brings the all black everything look home.