Rihanna performs a four-song set at the Pepsi Smash Super Bowl Bash at Florida State Fairgrounds' Ford Amphitheatre on Thursday (January 29) in Tampa, Fla.The 20-year-old singer certainly looked football sexy with her shin guards and kneepads. She even seamlessly worked in a hot pair of Christian Louboutin booties!The event, which was sponsored by VH1, also had performances by Fall Out Boy and Lifehouse. Rihanna performed four of