Cher will return to cinema in the Mamma Mia! sequel, marking the 71-year-old Oscar winner's first appearance in a film since 2010's Burlesque.
She confirmed her involvement on Twitter, but didn't reveal what role she will play.
A mysterious tweet, which says "Fernando" in all caps, could offer fans insight about what to expect—perhaps Cher will perform Abba's 1980 single off Gracias Por La Música?
— Cher (@cher) October 16, 2017
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.