ABBA reunites and performs together for the first time in 30 years

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'Mamma Mia!' ABBA Makes Rare Reunion Appearance

Mamma Mia, here we go again!

The four members of ABBA reunited on Sunday night to commemorate the famed band's 50th anniversary of friendship -- and as band members -- in Stockholm, Sweden. Not only that, but the band members also performed all together for the first time since 1986 -- thirty years ago!

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The party, which took place at Berns Salonger in downtown Stockholm, marked 50 years since the male band members Björn Ulvaeus and Benny Andersson met for the first time, on June 5, 1966.

See what the band looks like now and more iconic moments through the years:

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ABBA through the years
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ABBA reunites and performs together for the first time in 30 years
Source: Entertainment Weekly
UNSPECIFIED - JANUARY 01: Photo of Abba (Photo by Michael Ochs Archives/Getty Images)
UNSPECIFIED - JANUARY 01: Photo of Abba (Photo by Michael Ochs Archives/Getty Images)
UNSPECIFIED - JANUARY 01: Photo of Abba (Photo by Michael Ochs Archives/Getty Images)
UNSPECIFIED - JANUARY 01: Photo of Abba (Photo by Michael Ochs Archives/Getty Images)
UNSPECIFIED - JANUARY 01: Photo of Abba (Photo by Michael Ochs Archives/Getty Images)
UNSPECIFIED - JANUARY 01: Photo of Agnetha FALTSKOG and ABBA and Bjorn ULVAEUS and Anni Frid LYNGSTAD and Benny ANDERSSON; L-R: Bjorn Ulvaeus, Anni-Frid Lyngstad (back), Agnetha Faltskog, Benny Andersson - posed, studio, group portait (Photo by RB/Redferns)
circa 1974: Swedish pop group Abba arriving at London Airport. (Photo by Evening Standard/Getty Images)
UNITED KINGDOM - JANUARY 01: Photo of ABBA; L-R: Benny Andersson, Agnetha Faltskog, Anni-Frid Lyngstad, Bjorn Ulvaeus - posed, group shot (Photo by Gems/Redferns)
UNSPECIFIED - CIRCA 1970: Photo of ABBA Photo by Michael Ochs Archives/Getty Images
9th April 1974: Swedish pop star Bjorn Ulvaeus of ABBA, puts a reassuring arm around his fellow member of the band, Agnetha Faltskog, who is ill in bed. (Photo by John Downing/Express/Getty Images)
Abba group shot, London, 1974, (L-R) Bjorn Ulvaeus, Anni-Frid Lyngstad, Agnetha Faltskog, Benny Andersson. (Photo by Michael Putland/Getty Images)
COPENHAGEN, DENMARK: ABBA pose holding silver discs for sales of 25000 of the album Waterloo, (L-R) Bjorn Ulvaeus, Agnetha Faltskog, manager Stikkan Andersson, Anni-Frid Lyngstad, Benny Andersson and Kurt Mikkelsen of EMI Denmark in 1974 in Copenhagen, Denmark. (Photo by Jorgen Angel/Redferns)
COPENHAGEN, DENMARK: An actor playing Napoleon (centre) poses with the pop group Abba, (L-R) Björn Ulvaeus (Bjorn Ulvaeus), Anni-Frid Lyngstad, Agnetha Fältskog (Agnetha Faltskog), Benny Andersson, to promote their single Waterloo in Copenhagen, Denmark in 1974. (Photo by Jorgen Angel/Redferns)
NEW YORK - 15th NOVEMBER: Swedish group Abba posed backstage on Saturday Night Live TV show in New York on 15th November 1975. Left to right: Anni-Frid Lyngstad, ?, Agnetha Faltskog, Bjorn Ulvaeus and Benny Andersson. (Photo by Fin Costello/Redferns)
GERMANY - SEPTEMBER 01: Photo of Agnetha FALTSKOG and ABBA; Agnetha Faltskog - posed (Photo by Petra Niemeier - K & K/Redferns)
COPENHAGEN, DENMARK: Pop group Abba pose for a group shot, (L-R) Benny Andersson, Anni-Frid Lyngstad, Agnetha Fältskog (Agnetha Faltskog) (front) and Björn Ulvaeus (Bjorn Ulvaeus), in May 1975 in Copenhagen, Denmark. (Photo by Jorgen Angel/Redferns)
Swedish pop group Abba, wearing kimonos, 1976. Left to right: Bjorn Ulvaeus, Agnetha Faltskog, Frida Lyngstad and Benny Andersson. (Photo by RB/Redferns/Getty Images)
(GERMANY OUT) Singer Anni-Frid from ABBA with young fans in Stockholm, 1978. (Photo by Wolfgang Kunz/ullstein bild via Getty Images)
Benny Andersson, Agnetha Faltskog, Anni-Frid Lyngstad and Bjorn Ulvaeus of ABBA (Photo by Ron Galella/WireImage)
THE HAGUE, NETHERLANDS - NOVEMBER 23: Abba perform live on the Dutch TV programme 'Een Van De Acht' on November 23 1976. L-R Benny Andersson, Agnetha Faltskog, Bjorn Ulvaeus, Anni-Frid Lyngstad. (Photo by Gijsbert Hanekroot/Redferns)
UNITED STATES - JANUARY 01: Photo of ABBA; L-R: Bjorn Ulvaeus, Agnetha Faltskog, Anni-Frid Lyngstad, Benny Andersson - posed, group shot (Photo by Richard E. Aaron/Redferns)
UNITED STATES - OCTOBER 02: RADIO CITY MUSIC HALL Photo of ABBA and Bjorn ULVAEUS and Agnetha FALTSKOG and AnniFrid LYNGSTAD and Benny ANDERSSON, Group performing on stage L-R Bjorn Ulvaeus, Agnetha Faltskog, Anni-Frid Lyngstad and Benny Andersson (playing accordion) (Photo by Gai Terrell/Redferns)
UNITED KINGDOM - NOVEMBER 01: WEMBLEY ARENA Photo of ABBA, L-R: Bjorn Ulvaeus, Agnetha Faltskog, Anni-Frid Lyngstad, Benny Andersson performing live onstage (Photo by David Redfern/Redferns)
Bjorn Ulvaeus, a member of Swedish disco group ABBA speaks to journalists during the opening of 'Mamma Mia! The party', a new restaurant in Stockholm where people can eat while watching a show based on ABBA's songs on January 20, 2016 in Stockholm. / AFP / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)
Agnetha Faltskog (C), member of Swedish disco group ABBA attends the opening of 'Mamma Mia! The party', a new restaurant in Stockholm where people can eat while watching a show based on ABBA's songs on January 20, 2016 in Stockholm. / AFP / JONATHAN NACKSTRAND (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)
BERLIN, GERMANY - FEBRUARY 10: Andrea Schoeller, Ludvig Andersson and his girlfriend Mimi Schoeller, Benny Andersson, Founder of ABBA, during 'The Circle' Premiere during the 65th Berlinale International Film Festival at Haus der Kulturen on February 10, 2015 in Berlin, Germany. (Photo by Gisela Schober/Getty Images)
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According to Expressen and Entertainment Weekly, female members Agnetha Fältskog and Anni-Frid Lyngstand began performing the group's song, "Me and I," before bandmates Ulvaeus and Andersson joined them on stage to end the song. Though no video has surfaced from the moment (yet!), sources at the event described the moment as "amazing" and "great."

"It was absolutely amazing," Lyngstad said. "A lot of emotions. We've made this journey throughout our history -- Benny and Björn in particular. It's been very nostalgic."

This was the band's second full reunion in six months, which is significant given the band's unpredictable history. Check back here for updates on their buzzed-about reunion.

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