Springsteen caught last night's Pearl Jam show

In this picture made available Thursday, July 4, 2013, U.S singer Bruce Springsteen & The E Street Band perform during a concert at the Stade de Geneve stadium in Geneva, Switzerland, Wednesday, July 3, 2013. (AP Photo/Keystone, Martial Trezzini)

Bruce Springsteen caught Pearl Jam's show at the Wells Fargo Center last night and the @PJ_Updates Twitter feed snapped a pic of the Boss in full on incognito mode.

Springsteen and Pearl Jam lead singer Eddie Vedder are longtime buddies. Vedder attended Springsteen's shows at Citizens Bank Park last year.

Former "Saturday Night Live" performer Will Forte, in town to screen his new film "Nebraska" at the Philadelphia Film Festival, also attended the show.