Jay-Z was joined on stage by Rihanna during a gig in Los Angels on Sunday.

The singer appeared alongside the rapper to sing her cameo on 'Run This Town', which features on Jay-Z's recent album 'The Blueprint 3'.

It is one of the first times Rihanna has performed in public since she was attacked by ex-boyfriend Chris Brown in February.

The singer is currently promoting her new album, 'Rated R', which is released on November 23.

Justin Timberlake and girlfriend Jessica Biel were among the host of celebrities who watched Jay-Z's gig at UCLA's Pauley Pavilion.

The rapper is currently on a nationwide US tour.

(by Jason Gregory)