The star studded line up for the Billboard Music Awards has included Prince, Taylor Swift, Justin Bieber, Miguel and Bruno Mars till now.

Today it was announced that Selena Gomez, Kacey Musgraves, the Band Perry, Macklemore and Ryan Lewis, Christina Aguilera, and Pitbull will join them.

This year’s Billboard Music Awards is expected to be very interesting.

Swift, Maroon 5 and Fun are among the favorites, each having been nominated in 11 categories.

Rihanna has a chance in 10 categories. Rihanna will be competing against Justin Bieber, One Direction, Maroon 5 and Swift for Top Artist.

One Direction and Carly Rae Jepsen are nominated for 9 categories each.

One of the more interesting moments of the night will be the honoring of Prince. He will receive the Billboard Icon Award.

Fans can cast votes this year for the Milestone Award. The finalist for the award are Taylor Swift, Bruno Mars and Justin Bieber. Votes are being taken at Billboard.com/milestone.

For those who do not know, the 2013 Billboard Music Awards will air live  on Sunday, May 19th, on ABC.