It's being called the biggest concert ever and 'American Idol' is all over it.

Ryan Seacrest will host the new iHeartRadio music festival, while 'Idol' judges Jennifer Lopez and Steven Tyler are slated to perform.

The festival, named after the popular app, will take place at the MGM Grand in Las Vegas on September 23 and 24. 'Idol' alum Carrie Underwood, John Mayer, The Black Eyed Peas, Coldplay, Lady Gaga, Bruno Mars and Nicki Minaj are some of the other names attached to the festival, as well. Other acts will be announced as the festival draws near.

When talking about the festival, Seacrest commented, "The iHeartRadio Music Festival, like the iHeartRadio digital radio service, will showcase top artists across all genres of music. Listeners from all over America will travel to Las Vegas to celebrate the next generation of iHeart Radio, while seeing the greatest musicians in the world on one stage."

And there you have it folks -- the ingredients for the biggest music festival in history.

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