VIDEO: Ariana Grande & Ryan Seacrest Share Big Announcement on GMA

Ryan Seacrest and Ariana Grande appeared on this morning's GMA to share a big announcement about the upcoming, star-studded iHeart Radio Festival. Check out the appearance below!

The legendary weekend-long concert will take place on September 19 and 20 in Las Vegas.

This year's lineup will feature Taylor Swift, Coldplay, Usher, Ariana Grande, Nicki Minaj, Mötley Crüe, Zac Brown Band, One Direction, Ed Sheeran, Paramore, Iggy Azalea, Train, Eric Church, Lorde, Calvin Harris, Bastille, Steve Aoki and more. Highlights of the show will include performances from this year's Macy's iHeartRadio Rising Star winner, Before You Exit, as well as other surprise special guests and never-before-imagined collaborations. The fourth annual event will kick off Friday evening, September 19 at the MGM Grand Garden Arena with host Ryan Seacrest, host and producer of "On Air with Ryan Seacrest," his market-topping No. 1 nationally Syndicated LA morning drive-time show for Clear Channel's 102.7 KIIS-FM, as well as nationally-syndicated Top 40 radio show.

The iHeartRadio Music Festival Village will return to The Lot across from Luxor Hotel & Casino on Saturday afternoon with live performance by Iggy Azalea, Neon Trees, Kacey Musgraves, Childish Gambino, Magic!, The Pretty Reckless, Nico & Vinz, Lil Jon and more to be announced. The afternoon event will also feature fan zones and interactive experiences by iHeartRadio's brand partners.

Beginning today at 4 p.m. EST/1 p.m. PST, MasterCard cardholders will have access to a limited number of tickets through a first-ever pre-sale for the iHeartRadio Music Festival. Tickets will be available only at iheartradio.com/priceless. Tickets will go on sale to the general public on July 26 at 1 p.m. EST/10 a.m. PST via Ticketmaster.com.

The iHeartRadio Music Festival will broadcast live on Clear Channel radio stations for fans throughout the country across 150 markets and will stream live on Yahoo Screen (http://yahoo.com/iheart) each night at 7:30 p.m. PST. The iHeartRadio Music Festival will also return to The CW Network as an exclusive two-night special on September 29 and 30 from 8:00-10:00 p.m.

ARIANA GRANDE first landed at the top with her first full-length album for Republic Records, Yours Truly. It debuted at #1 on the Billboard Top 200, Billboard Digital Albums Chart, and iTunes Overall Albums Chart. Moreover, it yielded the game-changing pop smash "The Way" featuring Mac Miller. One of 2013's defining songs, the single went double-platinum, hit the Top 10 of the Billboard Hot 100 and reached #1 on the iTunes Overall Top Songs Chart. Grande made her Broadway debut in the musical '13.'

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