Carrie Underwood won five Billboard Music Awards on Monday night (Dec. 4) at the MGM Grand Garden Arena in Las Vegas. Her trophies included country album, new country artist, female country artist, album and female Billboard 200 album artist. Kenny Chesney won country songs artist. Presenters included Big & Rich and Wynonna. Winners were determined by the artists' performance on the Billboard charts. R&B artist Mary J. Blige was the night's biggest winner, taking home nine awards.