Fergie
THOSE BOOTS.
Fergie
A sample of the singer's new single, "L.A. Love (la la)," was played onstage as she introduced Ed Sheeran. The song is set for release on Sept. 29.
Liam Payne, Harry Styles, Zayn Malik, Louis Tomlinson and Niall Horan
One Direction performs onstage during the 2014 iHeartRadio Music Festival.
Harry Styles
The One Direction singer and his hair wish for peace to be upon you.
Darren Criss
Exactly.
Sophia Bush
The One Tree Hill alum meshed well at the event!
Hilary Duff
Because why not?
Iggy Azalea
Who dat? Who dat? It's the "Fancy" performer singing live in Las Vegas.
Jiff the Dog
This Pomeranian appears in Katy Perry's "Dark Horse" video and broke two Guinness World Records for speed. Superstar!
5 Seconds of Summer
The boy band is ready to rock Sin City!
Ed Sheeran
The "A-Team" singer stops for photos backstage before his set.
Iggy Azalea & Macklemore
Artists never know who they will run into at the music festival!
Kacey Musgraves
Country fans better put their hands together for the "Merry Go Round" singer.
One Direction
The boys of 1D open up the show at Saturday's festival!
Ariana Grande
After her iHeartRadio performance, the "Break Free" singer headed to 1 OAK Nightclub at The Mirage with Big Sean.
Taylor Swift
The pop singer rocks a crop top and eye-catching mini skirt on the red carpet at the 2014 iHeartRadio Music Festival.
Ariana Grande and Nicki Minaj
The two sure are cute together, no butts about it! They performed the hit song "Bang Bang."
Usher and Alicia Keys
Usher puts his hand on the singer's baby bump!
Jennifer Lawrence
The actress is seen walking with an iHeartRadio Music Festival worker backstage.
Taylor Swift
The pop star sparkled on stage at the 2014 iHeartRadio Music Festival.
Jennifer Lawrence
The actress visited Coldplay's dressing room. She and singer Chris Martin have been dating since at least late June.
Jennifer Lawrence
The Oscar winner and The Hunger Games star is seen backstage at the iHeartRadio Music Festival. Beau Chris Martin performed with his group Coldplay at the event.
Chris Martin
The rocker performed with his band Coldplay. New girlfriend Jennifer Lawrence visited the group in their dressing room!
Nicki Minaj and Ariana Grande
J.Lo and Iggy Azalea aren't the only chart-topping superstars to get cozy during a performance ...