Filming for Mamma Mia: Here We Go Again is currently underway in the UK, where Cher is stationed alongside many actors from the original: Meryl Streep, Pierce Brosnan and Dame Julie Walters.
The follow-up film's plot hasn't yet been announced, but it's set to feature flashbacks from Lily James as a young version of Donna (played by Streep in the original). There will also be a full, new soundtrack with Abba songs not included in the 2008 movie.
Cher has previously starred in a number of films, including Mermaids, The Witches of Eastwick and Moonstruck, for which she won a best actress Oscar in 1988.
Mamma Mia: Here We Go Again will premiere in summer 2018.