Mamma Mia! Abba are back together again: Group reunites for the first time in eight years for opening of new restaurant in Stockholm

The world-famous Swedish quartet ABBA (pictured left now and right in 1975) got together for the opening night of a new restaurant in Stockholm - where people can eat while watching a show based on the group's songs. Agnetha Fältskog, 65, Björn Ulvaeus, 70, Benny Andersson, 69, and Anni-Frid Lyngstad, 70, were last pictured together in 2008, when they walked the red carpet at the film premiere of Mamma Mia!, based on the musical of the same name. ABBA formed in Sweden in 1972 and topped the charts worldwide from 1975 to 1982.