Abba Reunites! See the Band Members Then and Now

Who could ever forget the iconic Swedish pop group ABBA? The voices behind such beloved hits as "Dancing Queen," the group is one of the most commercially successful acts in pop music history. And from the looks of things, they're still friends.

The 1970s group, which enjoyed immense popularity in Europe, the U.S., and Latin America, consisted of (from left) Agnetha Fältskog, Benny Andersson, Björn Ulvaeus, and Anni-Frid Lyngstad (known as Frida).

In the group's heyday, Fältskog and Ulvaeus were married, as were Lyngstad and Andersson. The marriages ended in 1979 and 1981 respectively.

But all members of the group showed up to support Ulvaeus (shown on the left in 1977) for the opening night "Mamma Mia," his new Greek taverna in Stockholm, where guests are invited to sing along to ABBA tunes.

Here's Agnetha Fältskog, shown here in 1976 and at the restaurant opening.

Group members including Anni Frid Lyngstad (shown in 1978) were dressed quite differently than they were in their days of peak popularity.

Benny Andersson (shown in 1976), who is still involved in performing today, posed for pictures at the event.

On the group's Facebook page, they called it an "amazing night." We couldn't agree more!