Cher and Meryl Streep shared a kiss on the red carpet

STUDIOLily James plays the younger Donna

STUDIOLily James plays the younger Donna

ET caught up with Cher a day ahead of Monday's premiere, and the celebrated performer showered her co-star and long-time pal with effusive praise.

Mamma Mia: Here We Go Again is in theaters on Friday, June 20.

According to The Richest, Cher's net worth is approximately $305 million. "Here We Go Again" sees old faces return and new ones join the ABBA sing-along set on a picturesque Greek island where stars belt out tracks by the hugely popular Swedish band.

LONDON (Reuters) - Amid olive trees and plenty of ABBA tunes, the musical world of "Mamma Mia" took over a London theater on Monday for the film sequel's world premiere with Oscar victor Meryl Streep and pop diva Cher among the attendees.

Yes, we know Donna eventually courted two other men, but Sam was the first, and since Donna-spoiler alert-ends up marrying him, let's stick with July 17.

Taking place 5 years after the events of the first film, we learn right away that Donna has passed, though we're never told exactly how.

Seyfried and Cooper dated for about three years after filming 2008's Mamma Mia! "After I did "Fernando" [in the movie] I thought it would really be fun to do an album of ABBA songs, so I did", she said.

Besides Streep and Cher, actors Pierce Brosnan, Colin Firth and Amanda Seyfried reprised their roles in the new movie. Skeptics beware - Mamma Mia!

Even after their real-life breakup, they stayed friends, good friends, as Seyfried said in a 2013 interview. The former half of folk duo Sonny and Cher enjoyed a career revival in the 1990s and holds the record for the longest gap between number-one songs on the U.S. chart at almost 25 years.

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