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Posted Sat, September 22, 2012 12:44pm EDT

2012 iHeartRadio Music Festival: Rihanna, Pink & More — Pics

Some of the hottest artists in the music industry came together for opening night at the 2012 iHeartRadio Music Festival on Sept. 21! See the pic and read on for more details.

Rihanna, Pink, No Doubt and more came together in Las Vegas, Nevada for the iHeart Radio Music Festival on Friday September 21!

Fans certainly got their money’s worth during opening night — Rihanna bared her butt and Billie Joe Armstrong of Green Day bashed Justin Bieber!

Can you believe it, HollywoodLifers? Who do YOU think was the best performer of the night?

— Christopher Rogers