Robert Plant joined collaborator and romantic partner Patty Griffin onstage at the tiny Continental Club in Austin, Texas on Saturday night (December 15th) for a set that included reworked versions of a number of Led Zeppelin classics. Griffin introduced Plant as her "driver" about 30 minutes into her set, saying, "Three years ago a guy with big hair and a British accent called me and said he needed help singing on their record. I followed him on the road for 18 months and after it all he said he'd be my driver."

Plant bounded onstage wearing a chauffeur's cap, which he promptly removed as the couple went through several more of Griffin's own songs as well as Zeppelin chestnuts like "Black Country Woman," "What Is And What Should Never Be," "Tangerine," "Going To California" and "Black Dog."

The show was the first of two for the couple, with both gigs acting as benefits for injured and uninsured Austin musician Michael Fracasso and the Health Alliance for Austin Musicians medical assistance program.

Plant and Griffin, who now live together in Austin, met when Plant hired Griffin as a singer for his 2010 tour with Band Of Joy. It's been reported that the couple are married, but they've never officially announced that.

Plant recently got together with former Zeppelin bandmates Jimmy Page and John Paul Jones to promote the release of Celebration Day, a CD/DVD/BD set chronicling the band's December 2007 concert in London. The group has ruled out any future Zeppelin performances or tours for now.