The biggest names in music will attend the Billboard Music Awards on Sunday night. Performers include Justin Bieber, Bruno Mars, Lil Wayne, Pitbull, Christina Aguilera and the Band Perry, and presenters include Miley Cyrus, PSY, Shania Twain and Ke$ha. Taylor Swift, fun., Rihanna and Maroon 5 are among the finalists. The ceremony, hosted by actor/comedian Tracy Morgan, will be televised live on ABC. Click through to see what the stars wore on the red carpet at the event.