The Boss thrilled the crowd with a hits-packed, three-hour long gig with his E Street Band, and fans were left delighted when he introduced stars including Rage Against The Machine's Tom Morello and John Fogerty to join him onstage in Hyde Park.
However, Springsteen kept his biggest surprise until the end of the concert, when Sir Paul McCartney walked out for the encore.
They sang "I Saw Her Standing There" and "Twist and Shout," but before the superstars could address the crowd, their microphones were cut off due to strict timings for the show.
The crowd chanted, "Turn up the sound", and the pair carried on singing despite the loud speakers being switched off.
E Street Band member Steven Van Zandt was left fuming by the curfew enforcement, and took to his Twitter page after the concert to express his anger.
In a series of posts, he writes, "One of the great gigs ever in my opinion. But seriously, when did England become a police state? We break curfews in every country... We would have been off by 11 if we'd done one more. On a Saturday night! Who were we disturbing?"
"The cops got nothing more important to do? How about they go catch some criminals instead of f**king with 80,000 people having a good time? English cops may be the only individuals left on earth that wouldn't want to hear one more from Bruce Springsteen and Paul McCartney! I'm sorry but I have to be honest I'm p**sed."
"Like I said, it didn't ruin the great night. But when I'm jamming with McCartney don't bug me! If it's a public transport issue I'm sorry but people are adult enough to go get a train if they need to without the cops pulling the plug!"
"Hard Rock would have let us play all night. There's no grudges to be held. Just feel bad for our great fans. Hard Rock is cool. (Promoter) Live Nation is cool. It's some City Council stupid rule."