Saturday, August 25, 2012 - Rihanna and Rob Kardashian have a blast at a go-kart range in Burbank, CA with friends. Rihanna shows of her speed-racer skills and finishes 1st, leaving Rob in the dust in 6th place. Rihanna is in a good mood as she leaves the range headed to Hollywood, where the "love of her life" Chris Brown is partying.