The Boss made a special and very low-key guest appearance at a private show at the Wonder Bar in Asbury Park, N.J. this past weekend.

Bruce Springsteen first  took the stage at legendary Madison Square Garden to perform with Bono and U2. The Boss then made a surprise guest appearance with his brother-in-law Michael Scialfa's band, Timepiece at the now famous Wonder Bar.

Watch Bruce in Asbury Park and on stage at MSG with U2.