EXCLUSIVE: Jennifer Lopez Will Rock Las Vegas' iHeartRadio Fest Ahead of Residency

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Jennifer Lopez
is heading to Las Vegas a bit sooner than we thought.

ETonline has learned that J.Lo is the latest superstar to join this year's iHeartRadio Music Festival lineup, joining Kanye West, Sam Smith, The Who, Coldplay, Puff Daddy, Demi Lovato, David Guetta, Kenny Chesney, The Weeknd, Tove Lo, Lil Wayne, Fall Out Boy, Disclosure, Hozier, Jason Derulo, Duran Duran, Prince Royce, Diplo, Trey Songz, The Killers, Blake Shelton, Nick Jonas, Janet Jackson and more surprise guests, on the bill.

WATCH: J.Lo on Las Vegas Residency: 'I've Been Preparing for This My Whole Life'

It all goes down on Sept. 18 and 19 at the MGM Grand in Sin City, and will air as a two-night special on The CW on Sept. 29 and 30. (J.Lo will perform on the second night.) The performances will also be broadcast live on iHeartMedia radio stations and live streamed via Yahoo Live as they happen.

The show comes mere months before Lopez is set to kick off her highly anticipated residency at Planet Hollywood.

"I think I've been preparing for this my whole life," J.Lo told ET last month. "I'm excited about going to Vegas [and] doing the kind of quintessential show that I've always had in my mind."

NEWS: It's Official! All the Details on J.Lo's Upcoming Residency

The 46-year-old stunner teased a show that will feature all her pop hits, while embracing "my Latin side, my fun side, and my hip-hop side."

"It's gonna have everything that I've been known to do over the years, and it's gonna be a beautiful, glamorous kind of Vegas show," she said. "Something that I think people, whether you're a fan of my music or not, would come and see and really enjoy. That's my goal."

But in the meantime, J.Lo is also busy making American Idol's farewell season the best one yet. See what she had to say about returning to the judges' table in our interview below.