Amanda Seyfried is just like Us when it comes to imagining a potential plot for Mamma Mia! 3. "If I don't get it, I will be pissed. I really want to be in it, but I don't know much else about it," Seyfried, 40, said of hoping for her character Sophie Sheridan's involvement in the sequel on The Graham Norton Show on Friday, February 6. Seyfried recently revealed that she'd want to see Sophie raising children, mirroring her experience with motherhood in real life. (Sophie welcomed a son, Donny, at the end of Mamma Mia! Here We Go Again.