Popsugar Entertainment Mamma Mia 2 Mamma Mia! Here We Go Again New Cast Members See the Original Mamma Mia! Cast and Their Younger Selves, Side by Side 17 July 2018 by Kelsie Gibson View On One Page Photo 2 of 6 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Hugh Skinner and Colin Firth as Harry The 33-year-old Fleabag actor will play a younger Harry. Previous Next Start Slideshow Mamma Mia 2MoviesMamma Mia