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Lady Gaga, Jennifer Lopez Rock iHeartRadio Festival

Nicki Minaj, Joe Jonas also appear in Las Vegas...

By David Renshaw on Monday 26th September 2011 Photo by Splash

Lady Gaga and Jennifer Lopez were amongst the star performers at this weekend's iHeartRadio festival.

The two day event, held at the MGM in Las Vegas, also drew performances from Nicki Minaj, Joe Jonas, Black Eyed Peas, David Guetta plus reality TV judging rivals Nicole Scherzinger and Steven Tyler.

Perhaps the biggest moment of the night came when Lady Gaga duetted with Sting live onstage.

Take a look at the pictures above to check out all of the action.

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