The victory capped an extra special day for Barça fans, many of whom were celebrating the Sant Jordi Festival, a day of love in which Catalans traditionally exchange books and roses.
Special guests on hand included the former Real Madrid player Raúl González, now the La Liga representative in the United States, and the former Barça defender Gianluca Zambrotta, who represented the Catalan club at the event.
"The house was packed," said one ecstatic Barça fan, barely able to contain herself. "We gave away roses and books for St Jordi, the fans received Zambrotta and Raul with great excitement, and when we won, the crowd went wild!"
The rooftop viewing party, it appears, was an instant classic.