Spears joining Lauper on stage?

Britney Spears

Britney Spears is rumoured to be planning a surprise event by joining Cyndi Lauper on stage for the 80s icon's Saturday concert in LA.

The Insider says the show will also feature Margaret Cho, Debbie Harry, the Dresden Dolls, Erasure and Rosie O'Donnell.

This would make yet another step forward for the troubled and out-of-favour Spears, who is slowly warming up to stage a very slow comeback this year.