'Mamma Mia 3' could be in the works, according to producer
Amanda Seyfried tells the story behind 'Mamma Mia' cast's matching tattoos
Cher is releasing a whole album of ABBA covers
Watch Amanda Seyfried Sing 'Dancing Queen' With A Twist On Jimmy Fallon
Trailer for 'Mamma Mia! Here We Go Again' is here