Plans to make 'Mamma Mia 3' are already in the works.Christine Baranski - who has starred in the 'Mamma Mia' film franchise - has revealed that producer Judy Kramer is currently working on the next movie in the series.The 72-year-old actress told The Hollywood Reporter: "I was in London with Judy Kramer at our favorite watering hole, she is planning 'Mamma Mia 3'. She gave me the narrative plotline of how it’s going to happen. That’s all I can say! "But, it’s not like, 'Oh, I wish it could happen!' Judy Kramer makes things happen."The 'Mamma Mia' franchise has featured the likes of Pierce Brosnan, Dominic Cooper, Colin Firth, Amanda Seyfried, Stellan Skarsgard and Meryl Streep, and Christine believes that Judy has the pulling power to reunite the star-studded cast for a new movie.The actress explained: "[Judy] made number two happen, and it was a phenomenal hit.