Mamma Mia! 3

Amanda Seyfried hopes that 'Mamma Mia! 3' will include Sabrina Carpenter and Sydney Sweeney in a surprise role. She says she's "all for it" and believes other returning characters—and ABBA's music—will bring fans back in a tropical third chapter.

Amanda Seyfried affirms that 'Mamma Mia! 3' is in the works and remains hopeful it'll reach production despite scheduling and studio delays.