Thousands of Arsenal fans took to the streets of London to celebrate as the team paraded the Premiership trophy.
Islington was a sea of red and white as fans cheered manager Arsene Wenger and his players in their open-topped buses.
Wenger and a host of others took to the town hall balcony to make speeches and savour becoming the first team since 1889 to end a season unbeaten.
"I feel privileged to share a historical moment in the life of Arsenal with you," said Wenger.
Captain Patrick Vieira added: "It has been a fantastic season. We achieved something unbelievable but we couldn't have done it without the fans."
England defender Sol Campbell said: "It's a truly monumental season, what we've achieved is fantastic."
Star striker and player of the season Thierry Henry said: "I'll keep it simple. In season 2003/04, a team went unbeaten in the league. That team is Arsenal."
Three coaches took the playing squad, coaching staff and members of their families from Highbury, on to St Paul's Road, down Upper Street to the Town Hall.
Each coach was emblazoned with "Champions 2003/2004" and portrait pictures of every member of the Highbury squad.
Vieira and Henry - two stars of their record-breaking league campaign - were at the front of the first bus to leave the stadium.
The Frenchmen flanked the Premiership trophy as celebrations of Arsenal's unbeaten league campaign began in earnest.
Arsenal fans sang and danced in a carnival atmosphere at the Town Hall, which was draped in a huge Gunners shirt.
Wenger, Henry, Vieira and Robert Pires took turns to lift the trophy to the jubilant fans before making their way off the bus to the Town Hall balcony, where several members of the first-team squad made speeches.
French coach Wenger was also presented with the Freedom of the Borough of Islington.
Vice-chairman David Dein lavished praise on Wenger: "I call him the miracle-worker. During his time here we've set new standards for the club.
"We've seen history made and I'd be surprised if it happens again. It's just been a privilege to watch Arsenal this season," he told BBC Sport.
After the men it was the turn of Arsenal Ladies, who showed off their Women's Premier League crown and FA Cup trophy too.