The always delightful Garbage frontwoman, Shirley Manson, joined Gwen Stefani on stage at LA’s Gibson Ampitheater this weekend for an impromptu duet of Gwen’s single ‘Wonderful Life’. If you recall, Garbage and No Doubt toured together in ’02 while the former was promoting BeautifulGarbage, and latter was pushing Rock Steady. Here’s a 30-second capture of the collaboration, via fan digicam. UPDATE: FULL VIDEO BELOW!