Pink surprises concert goers by performing with Gwen Stefani

Pink surprised concert goers by inviting Gwen Stefani on stage to perform with her.

The star was performing at the Staples Center when she brought the former No Doubt singer out to perform 'Just a Girl'.

Gwen clearly enjoyed her time performing with Pink, she even took to Instagram to share a short video of their performance...

"Ummmm so this happened! - Thank you Pink for having me - so much respect coming your way 😘 #justagirl" she wrote.