Now there's a surprise!

No Doubt had something in store for their fans when they brought out Pink during their performance at the iHeartRadio Music Festival but the band was probably awed as well when Gwen Stefani and Pink shared a kiss on stage!

Gwen and her group brought out the So What singer during a rendition of the their anthem, Just A Girl. After the quick collaboration, the two ladies planted one on each other. Talk about a friendly reunion!