iHeartRadio Concert

The stars were out in Las Vegas.

Nicki Minaj - Her feature-heavy debut Pink Friday was certified platinum this January, but Nicki told MTV that guest appearances are unlikely for her sophomore album. While Black Barbie has kept the details of her follow-up hushed, she did reveal to Billboard that her alter-ego Roman Zolanski will play a prominent role on the CD. "My best work is ahead of me, not behind me,” she told Good Morning America regarding her next effort. “Stay tuned.”  (Photo: Michael Kovac/Getty Images for Clear Channel)

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Nicki Minaj - Nicki Minaj looks like cotton candy as she excitedly performs onstage at the iHeartRadio Music Festival held at the MGM Grand Garden Arena on September 24, 2011 in Las Vegas, Nevada. (Photo:  Michael Kovac/Getty Images)

Justin Timberlake - Actor Justin Timberlake speaks onstage at the iHeartRadio Music Festival held at the MGM Grand Garden Arena on September 24, 2011 in Las Vegas, Nevada. (Photo: Christopher Polk/Getty Images for Clear Channel)

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Justin Timberlake - Justin Timberlake looks out into the crowd while amping them up for the acts set to perform at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: Christopher Polk/Getty Images)

Dr. Dre: February 18 - The Death Row mastermind turns 47. (Photo: John Sciulli/Getty Images)

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Dr. Dre - Rapper/producer Dr. Dre looks like he could go a few rounds in a Las Vegas prize fight, while chilling backstage at the VIP Lounge at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas. (Photo: John Sciulli/Getty Images)

Jennifer Lopez - Singer Jennifer Lopez lets the audience know she's still the Queen while performing on a throne onstage at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: Ethan Miller/Getty Imagesl)

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Jennifer Lopez - Singer Jennifer Lopez lets the audience know she's still the Queen while performing on a throne onstage at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: Ethan Miller/Getty Imagesl)

Usher - Usher looks more baby face than father of two as he's caught in this candid moment after performing onstage at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: John Sciulli/Getty Images)

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Usher - Usher looks more baby face than father of two as he's caught in this candid moment after performing onstage at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: John Sciulli/Getty Images)

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Lady Gaga - Lady Gaga turns it out and upside down while performing onstage at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: Christopher Polk/Getty Images)

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Lady Gaga - Lady Gaga turns it out and upside down while performing onstage at the iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada. (Photo: Christopher Polk/Getty Images)

Steven Tyler and Randy Jackson - Rocker Steven Tyler and his American Idol co-judge Randy Jackson show love in the VIP Lounge at the iHeartRadio Music Festival in Las Vegas. (Photo: by John Sciulli/Getty Images)

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Steven Tyler and Randy Jackson - Rocker Steven Tyler and his American Idol co-judge Randy Jackson show love in the VIP Lounge at the iHeartRadio Music Festival in Las Vegas. (Photo: by John Sciulli/Getty Images)

Photo By Photo: by John Sciulli/Getty Images

"Show Me What You Got," Jay-Z - "Show Me What You Got," the first single off Jay-Z's 2006 album Kingdom Come, released after the end of his musical hiatus, signaled a return to the top of the Billboard charts as well. (Photo: Christopher Polk/Getty Images)

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Jay-Z - Proud papa-to-be, Jigga wows the crowd at the iHeartRadio Music Festival in Las Vegas, Nevada. (Photo: Christopher Polk/Getty Images)

Jay and Alicia - Jay-Z brought Alicia Keys onstage to perform their hit "Empire State of Mind" at the iHeartRadio Music Festival in Las Vegas, Nevada. (Photo:  Ethan Miller/Getty Images)

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Jay and Alicia - Jay-Z brought Alicia Keys onstage to perform their hit "Empire State of Mind" at the iHeartRadio Music Festival in Las Vegas, Nevada. (Photo:  Ethan Miller/Getty Images)