The actress, who's denied knowledge of a sequel on numerous occasions in the past, now says she has heard that the project is being worked on.
"I know it's still going to be Abba music, because what else would it be. Come on, I wouldn't do Mamma Mia 2 without Benny and Bjorn" she told Newsbeat during press for "Chloe".
So she'd come back? "I will do it. And I know Meryl's game as well, so bring it on. It will be so cool."