Bruce Springsteen Makes Surprise Appearance With Steven Van Zandt

Bruce Springsteen made a surprise appearance in Beverly Hills on Saturday, joining former E Street Band guitarist Steven Van Zandt onstage. Van Zandt was performing with his band Little Steven & The Disciples of Soul when The Boss jumped on stage to join in on three songs, including Springsteen's "Tenth Avenue Freeze-Out". Springsteen's first new album in five years, Western Stars, will be out next month.

Ever been to a concert with a famous surprise guest star? Who was it?