Keith Urban and Tim McGraw will be country music's representatives for the 2013 iHeartRadio Music Festival. It's the third year of the multi-format concert in Las Vegas, and this lineup promises to be the biggest and best.

The iHeartRadio Music Festival has quickly become one of the biggest music festivals, with major artists from every genre taking the stage, and this year's lineup is no exception. In addition to Urban and McGraw, Justin Timberlake, Katy Perry, Elton John, Bruno Mars, fun., Ke$ha, and a special pairing of Queen with Adam Lambert will take the stage. Ryan Seacrest is again hosting this annual all-star music festival.

Seacrest, along with Miley Cyrus and Urban, made the festival lineup announcement with Sam Champion on 'Good Morning America' today (July 15), saying, "Everybody from all walks of life will be there." Tickets go on sale Saturday (July 20) at 1PM ET through Ticketmaster.

The two-day festival will be held on September 20 and 21 at Las Vegas' MGM Grand Arena. New this year is a Fan Village set to run during the daytime at a 15-acre parking lot adjacent to the arena on the Las Vegas Strip (free to ticketholders) and will feature performances from acts such as Cyrus, Avril Lavigne, AWOLNATION, Pete Tong, Twenty One Pilots and Jason Derulo.

Last year's iHeartRadio country artists were Taylor Swift, Miranda Lambert, Jason Aldean, and Brad Paisley. With each year, this festival continues to astound concert-goers with its wide array of top-notch acts, and it's yet another reason to hit Sin City.