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By Cassandra Vinograd

Mamma Mia! The four members of the pop supergroup ABBA have performed together for the first time in decades, according to local Swedish media.

Sweden's Expressen newspaper reported that the performance took place at a private party in downtown Stockholm over the weekend.

Swedish pop group Abba performs in London in November 1979.David Redfern / Redferns

It was a rare joint appearance for Agnetha Fältskog, Benny Andersson, Björn Ulvaeus and Anni-Frid Lyngstad — whose first initials form the letters of the band's name.

The music group officially disbanded in 1982 and last publicly performed together four years later. They turned down a $1 billion offer to tour together again, Andersson admitted in 2000.

According to Expressen, the brief but sentimental reunion performance took place at a party thrown by Ulvaeus and Andersson in honor of their 50-year friendship.

Fältskog and Lyngstad performed the song "Me and I" and dedicated it to the male songwriting duo — who then joined in towards the end of the song.

The band's official Facebook page posted a touching photo of the event with the caption "the way old friends do."

“It’s been a great night,” Andersson told Expressen.

Lyngstad told the newspaper: “It was absolutely amazing — a lot of emotions.”

The performance comes after the four reunited — but did not perform — in January to help launch a restaurant event.