Rihanna - Billboard Awards 2011

Rihanna suits up on the white carpet at the 2011 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 22) in Las Vegas, Nev.

The 23-year-old pop phenom leads the nominations this year with 18!

Rihanna is up for such awards as Top Artist, Top Female Artist, Top R&B Artist, Top R&B Album for Loud, Top R&B Song for “What’s My Name?”, and Top Hot 100 Song for “Love The Way You Lie.”

Rihanna started off the show with a performance of “S&M” featuring a surprise appearance by Britney Spears!

FYI: Rihanna is wearing a Max Azria suit, Neil Lane earrings and a cocktail ring, a Solange Azagury Partridge necklace, rings by Cartier, Jack Vartanian, Harry Winston, and Neil Lane, and Louboutin shoes.

10+ pictures inside of Rihanna at the Billboard Awards…