Music's biggest stars will all be in one arena next month at the iHeartRadio Music Awards. The event takes places at the Shrine Auditorium March 29 in Los Angeles, California.

Iggy Azalea and Sam Smith both earned five nominations and Ariana Grande and Taylor Swift earned four.

Fans will get a chance to vote on three different categories starting March 2. They include: Best Fan Army, Best Lyrics and the new award, the Renegade Award. Voting ends March 20, according to eOnline.

Up for the Artist of the Year Award is: Iggy Azalea, Luke Bryan, Ariana Grande, Sam Smith and Taylor Swift.

Here are some of the selected awards to be offered up at the ceremony.

Song of the Year: 

  • "All About That Bass" - Meghan Trainor
  • "All of Me" - John Legend
  • "Happy" - Pharrell Williams
  • "Shake It Off" - Taylor Swift
  • "Stay With Me" - Sam Smith

Best Collaboration:

  • "Bang Bang" - Jesse J, Ariana Grande and Nicki Minaj
  • "Dark Horse" - Katy Perry featuring Juicy J
  • "Fancy" - Iggy Azalea featuring Charli XCX
  • "Problem" - Ariana Grande featuring Iggy Azalea
  • "Talk Dirty" - Jason Derulo feautring 2 Chainz

Best New Artist:

  • Iggy Azalea
  • Bastille
  • Sam Smith
  • Cole Swindell
  • Meghan Trainor

Best Fan Army (fan-selected)

  • 5SOSFAM - 5 Seconds of Summer
  • Arianators - Ariana Grande
  • "Bey Hive" - Beyoncé
  • "Team Breezy" - Chris Brown
  • "Sheerios" - Ed Sheeran
  • 'Church Choir" - Eric Church
  • "Directioners" - One Direction
  • "Selenators" - Selena Gomez
  • "Mendes Army" - Shawn Mendes
  • "Swifties" - Taylor Swift

Best Lyrics (fan-selected)

  • "All of Me" - John Legend
  • "Blank Space" - Taylor Swift
  • "Counting Stars" - OneRepublic
  • "Habits (Stay High)" - Tove Lo
  • "Stay With Me" - Sam Smith
  • "Thinking Out Loud" - Ed Sheeran

What do you think of these nominees? Who do you want to win? Leave us a comment below and let us know.