Beyonce: Billboard Awards Press Room!

Beyonce changes outfits for an appearance in the press room following her performance at the 2011 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 22) in Las Vegas, Nev.

The 29-year-old entertainer, who wore a Lanvin dress, received the Billboard Millennium Award earlier in the evening for her career achievements.

Bey gave a show stopping performance of her new single “Run the World (Girls)” and was then presented the special award by her mother Tina Knowles.

10+ pictures inside of Beyonce in the press room after her performance…