Swedish pop superstars ABBA reunited Sunday night Stockholm at a private party to mark the group's 50th anniversary, reports newspaper Expressen. While the band didn't officially form until 1972, Agnetha Faltskog, Bjorn Ulvaeus, Benny Andersson and Anni-Frid Lyngstad met on June 5, 1966 and thus was the occasion for this fete which featured the group's first live performance in decades, playing "Me And I" from 1980's Super Trouper. The group, which featured married couples Bjorn & Agnetha and Benny & Frida (who both divorced before the end of the group), broke up in 1982, the gory romantic details of which are lyrically all over ABBA's last couple albums. No video has surfaced yet but a few more Instagrams are below. An actual reunion seems slightly less improbable now.

This was the second time this year that the four ABBA members had appeared together, the first of which was for the opening of a Mamma Mia! The Party dinner theater restaurant in Stockholm, which is based on the hit musical which, as your aunt will tell you, is based on their songs.