All four members of ABBA enjoyed a rare reformation on Sunday night (June 5).

The singers teamed up at the Berns Salonger hotel in Stockholm at an event marking the group's 50th anniversary.

They were joined by a host of Swedish stars at the party.

Images posted on social media shows the foursome performing music together.

ABBA haven't performed publicly since 1986.

They split in 1982 after selling millions of records.

Earlier this year the four singers reunited to appear at the opening of Stockholm’s Mamma Mia! The Party.

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Watch ABBA in action below: