Rihanna had half her costume missing!” became the running joke since the R&B star’s pre-Super Bowl performance last Thursday. Always the one to challenge fashion rules, the 21-year-old performed a medley of hits at the Pepsi Super Bowl Fan Jam 2010 wearing a one-shoulder, one-leg cat suit with white trimming, accessorized with fishnet stockings and black gloves.

Pepsi Super Bowl Fan Jam - Rihanna

Her outfit was designed by stylists Mariel Haenn and Rob Zangardi, who have helped Rihanna with other ensembles in the past. Other performers at the pre-Super Bowl event in Miami Beach were Justin Bieber, Young Jeezy, and Timbaland, but Rihanna soon stole the spotlight when she performed a number of songs from her recent album, Rated R, including “Rude Boy” and “Russian Roulette.”

Pepsi Super Bowl Fan Jam - Rihanna

Check out her live medley here. Just don’t get too distracted by her hot outfit.

* images courtesy of Getty