The iHeartRadio Music Festival 2015 will be commencing tonight, Sept. 18, in Las Vegas, and it's star studded. The event will be gathering Hollywood's finest, including Jennifer Lopez, The Weeknd, Kanye West and Demi Lovato. A live stream is available on Yahoo! Live for viewers to enjoy at home.

The presence of James Corden, Courtney Love, Rita Ora, Wilmer Valderrama, Taylor Lautner, "Pretty Little Liars'" Ashley Benson, Joe Jonas, Ashley Tisdale of "High School Musical," Nash and Hayes Grier, Kat Graham, Cheryl Burke, Nat Wolff, Becca Tilley, Josh Murray, Nick Viall and Matt Bomer of "Magic Mike," on iHeartRadio Music Festival 2015 were exclusively revealed by E! News.

Duran Duran, Tove Lo, Coldplay, Jason Derulo, Diplo, Prince, Walk the Moon, Tori Kelly, Echosmith and Disclosure will also be attending the show.

Kenny Chesney, The Struts, Zella Day, Shawn Mendes, Blake Shelton, Lil Wayne, Sam Smith, Fall Out Boy, Lee Brice, George Ezra, DJ David Guetta, Trey Songz, Big Sean, Hozier, The Killers, James Bay and Joe Jonas' brother, Nick, will also reportedly be making an appearance during the event, which will be live streamed via Yahoo! Live.

Meanwhile, two artists on the book list had reportedly cancelled their slated appearance — Janet Jackson and the legendary rock band The Who.

Jackson was reported that she was suffering from an ear issue, Fox 5 learned. Meanwhile, the band was also forced to cancel their other commitments because of Roger Daltrey's health.

The iHeartRadio Music Festival will be held at the MGM GRAND Garden Arena, and will take place on the evenings of Sept. 18 and 19. The event will be hosted by Ryan Seacrest, according to All Access.

For those who will not be able to make it, the iHeartRadio Music Festival will be broadcasted live on iHeartMedia radio stations across the United States. A live streaming is also available on Yahoo! Live beginning at 7:30 p.m.

The iHeartRadio Music Festival will also be featured on The CW — an exclusive two-night, special on Sept. 29 and Sept. 30 at 8 p.m.

Click HERE to view the live stream on Yahoo! Live!