Don't pull out the polyester and platforms just yet, folks. It was just for a movie premiere.

For the first time in more than two decades years, all four ex-members of ABBA appeared together at the Swedish premiere of Mamma Mia!, starring Meryl Streep, Pierce Brosnan and Colin Firth.

The Swedish pop/disco quartet—Benny Andersson, Björn Ulvaeus, Anni-Frid Lyngstad and Agnetha Fältskog—didn't perform, but throngs of fans went wild at the sight of all four together again in Stockholm.

They were joined on the red carpet and theater balcony by the stars of the soon-to-be released film. Mamma Mia! is a big-screen adaptation of the highly successful musical featuring ABBA's biggest hits, including "Dancing Queen," "Money, Money, Money" and "Take a Chance on Me."

The foursome shot to fame in the mid-'70s and performed together publicly for the last time in 1982. In 2000, they turned down $1 billion to reunite for a concert tour.