What happens in Vegas isn't staying in Vegas this time. The iHeartRadio Music Festival, taking place in Las Vegas September 18 and September 19 will be streamed on Yahoo Live (yahoo.com/iheart) each night at 10:30 E.T., so music fans around the world can watch the star-studded performances.

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Friday, Sam Smith, Coldplay, Kanye West, David Guetta, Disclosure, Duran Duran, Lil Wayne, Jason Derulo, Kenny Chesney and Demi Lovato will all perform. Saturday, performers include The Weeknd, Jennifer Lopez, Nick Jonas, Trey Songz, Diplo, Hozier, Prince Royce, Tove Lo, Puff Daddy and Fall Out Boy.

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Considering Jennifer Lopez and Puff Daddy (yes, the lineup says Puff Daddy, not P.Diddy, Diddy or one of Sean Combs' other monikers) are both slated to perform Saturday night, can we expect a little throwback reunion? You'll have to tune in to see if they play nice or avoid each other completely.

In addition to being streamed live online, it will also air on the CW September 29 and 30 at 8 p.m. So really, there's no excuse for missing any of the action.

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