New Jersey rock legend Bruce Springsteen performed at London's Hyde Park on Saturday night, and welcomed legendary Beatle Paul McCartney onstage for an assist on Beatles classics "I Saw Her Standing There" and "Twist and Shout."  The only problem was that Springsteen had already gone past the venue's 10:30 curfew by the time McCartney joined him.  As a result, venue officials pulled the plug on the band efore SPriongsteen could thank the crowd at the end of the show.  Check out a clip of the incident below.