The Swedish superstars were joined with other musicians, homegrown actors, celebrities and guests for a private party at the Berns Salonger hotel in downtown Stockholm, the Expressen reports.
The act split in 1982 and hasn't performed together since 1986. ABBA’s music has enjoyed a huge boost thanks to the lucrative Mamma Mia! stage show, which opened in 1999 in London and later became a Broadway hit. The jukebox musical has grossed more than $2 billion from more than 40 international stage adaptations and been seen by more than 55 million people.
Legend would have it the members of ABBA once turned down a $1 billion fee to reunite for a tour.
