The new ABBA inspired film stars Amanda Seyfried, Lily James, Christine Baranski, Julie Walters, Pierce Brosnan, Colin Firth, Stellan Skarsgård, Dominic Cooper, Andy Garcia, Cher and Meryl Streep.
It's hard to believe but the original 'Mamma Mia' was released almost 10 years ago, back in 2008.
Here's the trailer for the sequel, which reveals some of the ABBA songs that will be included...