The sixth annual iHeartRadio Music Festival is returning to Las Vegas — and the concert's got a newly announced line-up that's about to make everyone oooh.

The festival, which will take place at the T-Mobile Arena on September 23 and 24, will feature the likes of "Cheap Thrills" chart-topper Sia, Drake and Ariana Grande — and the "Make Me" Vegas showgirl Miss Britney Spears herself, who hasn't performed at a festival in well over a decade since 2004's Rock In Rio Lisboa. (!)

And that's not all: the weekend also includes performances from Zedd, Twenty One Pilots, Pitbull, Usher, Billy Idol and U2, among others. Latino pop troupe Los 5 will also perform as the official pick for this year's Macy's iHeartRadio Rising Star.

In addition, the 2016 iHeartRadio Daytime Village portion of the festival on September 24 will include performances by Panic! At The Disco, Alessia Cara, Hailee Steinfeld, Daya, The Chainsmokers and Troye Sivan.

Tickets for the iHeartRadio Music Festival are available now for pre-sale for Mastercard users through July 27 at 9 PM ET. General sale begins on Saturday, Jul 30 at 2 PM ET.

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