Kesha aka Ke$ha Pictures: Ke$ha arrives at the 2011 Billboard Music Awards held at the MGM Grand Garden Arena on May 22, 2011 in Las Vegas, Nevada.

The awards reflect Billboard's chart rankings based on key fan interactions with music, including album, single and digital sales, touring, streaming and social interactions on MySpace, Facebook and other popular online destinations for music. These measurements are tracked year-round by Billboard and its data partners. The Billboard Music Awards are based on the reporting period of February 28, 2010 through March 1, 2011, with top artists being recognized in a variety of genres, including R&B, Rap, Pop, Country, Rock, Latin and Alternative.

Photo credit: Andrew Evans / PR Photos