Green Day's Billie Joe Amrstrong treated a female fan to a smacker on the lips during a show in California last night (August 20).

Midway through the band's show at the Viejas Arena in San Diego, the singer climbed the stairs into the crowd.

Flanked by heavy security, the 37-year-old kissed a girl standing on the stairway much to the amazement of those nearby.

The show was the fifth to last date of the pop-punk outfit's sprawling North American tour which culminates at the Los Angeles Forum next Tuesday.

The band then head to Europe before rounding off the year with December shows in Australia and New Zealand.

(by Scott Colothan)