Then take on our quiz, timed to coincide with the release of the hotly anticipated sequel Mamma Mia!
After spotting Cher arrive at the premiere, fans tweeted their praise. He called me up and he said: 'You're doing Mamma Mia!' And he hung up ...
The two have a long history together; both have been in the film business for decades now, even co-starring in the 1983 thriller Silkwood alongside actor Kurt Russell, which Cher starred in early in her movie career.
But safe to say, when she does pop up towards the end to sing My Love, My Life as a duet with Seyfried's Sophie, there won't be a dry eye in the house.
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Cher and Andy Garcia perform Fernando from Mamma Mia!
The album, she said, would be a companion of sorts to her role in the all-ABBA movie musical, "Mamma Mia!".
The new film is a prequel to the original and pivots on daughter Sophie, played by Seyfried, who returns to the Greek island of the original, where her mother Donna runs a hotel, to announce that she's pregnant. Writer-director Ol Parker said that "people brought their husbands, wives, children and dogs" to watch the scene being filmed.
But if they decide to go for a third, I'd suggest sticking with Lily playing young Donna and Cher - just Cher.
"I don't know what I was expecting but I walked onto the set and I just thought everyone's just having fun", Cher said. 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.