Rapper Nicki Minaj, who recently became Britney Spears’ tour opening act after Enrique Iglesias pulled out, sang the hit “Super Bass” before the Pop Princess joined her to perform a short segment of “Till The World Ends” at the 2011 Billboard Awards held at the MGM Grand Arena in Las Vegas, Nevada on Sunday (May 22)- watch video below.

2011 Billboard Music Awards Winners (FULL List)

Britney looked absolutely incredible. So gorgeous! Brit’s hair hasn’t looked that good in over a decade! I kid! I wonder when we will actually hear Britney sing live because they are not even trying to pretend she is not lip-synching. Not good!

Rihanna & Britney Spears Rock “S&M” At 2011 Billboard Awards (VIDEO)

Nicki Minaj & Britney Spears Billboard Awards Video