iHeartRadio Music Festival 2012 Lineup: Taylor Swift, Rihanna

The line-up for this year's Clear Channel's iHeartRadio Music Festival has been announced by Ryan Seacrest Monday and will include today's top stars.

Taylor Swift, Rihanna, Usher, and Linkin Park are just a few of those appearing at 2012's festival in Las Vegas.

The 2-day event will take place on September 21 and 22 at the MGM Grand, and is billed as "the Biggest Live Music Event in Radio History."

Covering a wide array of genres, iHeartRadio has also lined up the rock music legendary band Aerosmith, country music star Brad Paisley, and rap superstar Lil Wayne.

Moreover, Bon Jovi, Green Day, Miranda Lambert, Mary J. Blige, and Shakira are also all on the ticket so far.

Other scheduled performers include Pitbull, Enrique Iglesias, No Doubt, Jason Aldean, P!nk, deadmau5, Swedish House Mafia, and Calvin Harris.

Tickets go on sale July 14, and the concert will be played live on iHeartRadio.com and Clear Channel stations across the country.

Last year's inaugural iHeartRadio Music Festival saw a huge success, and the event sold out in minutes.

Speaking about this year's iHeartRadio, 22-year-old Swift divulged that she specifically marked her calendar to attend.

"Unfortunately last year I couldn't be a part of the iHeartRadio Music Festival because I was on tour," explained Switft in a video on iHeartRadio.com. "And it was one of those things where I just saw everyone tweeting about it, I saw everyone talking about streaming it live on the internet and like, just how exciting and amazing it was, and I just thought, 'Next year I'm saving the date, I'm making sure that I'm there."

The country music darling is one of today's top performers, with legions of fans including over 16 million followers on Twitter.

"The idea that you can bring so many different formats and genres of music together and have everyone appreciating it- it highlights the differences between different musical acts," Swift continued. "It makes that a cool thing, it's like, 'Wow, we just saw so many different genres of music back to back,' and it's an amazing thing to do that."