VIDEO : Britney Spears and Iggy Azalea Will Perform 'Pretty Girls' at the 2015 Billboard Music Award

Britney Spears made a major announcement Wednesday! The 33-year-old pop star revealed to her fans in an Instagram video, "Vegas isn't just the home of my Piece of Me show, it's also the home of the Billboard Music Awards. I'll be taking the stage to perform 'Pretty Girls' with Iggy Azalea for the first time ever." "Pretty Girls" will impact radio stations May 5, twelve days before the awards show. Spears is no stranger to the Billboard Music Awards, of course, racking up six wins in 11 categories since 1999. She has performed on the show twice, including in 2011, when she had a pillow fight with Rihanna while singing "S&M."??