"I don't know when they're going to do it, but I know they're talking about it," Cher said of a third 'Mamma Mia ... of Harry (Hugh Skinner), Bill (Josh Dylan) and Sam (Jeremy Irvine).

It was the world premiere of Mamma Mia! Here We Go Again and the ... which in this instance is the young Harry. Josh Dylan (who can hold a note) is the young Bill, and Jeremy Irvine makes up ...