Last night Rihanna made a surprise appearance at Jay-Z's concert at UCLA's Pauley Pavilion, and she performed her part in "Run This Town" to an audience of screaming fans, including famous faces like Justin Timberlake, Jessica Biel and Jamie Foxx.

Rihanna sounds great, she looks great (we'll pretend she doesn't have that atrosh blond 'do) and we're thrilled that she's moving forward with her life and kicking ass with her career.