VIDEO : Trailer for 'Mamma Mia!' sequel is here

The trailer for the sequel to "Mamma Mia!" was released today, and it looks like we may learn how the "Dancing Queen" came to inhabit a Greek island. Meryl Streep and Amanda Seyfried return to the big screen as the mother-daughter duo. This time Sophie is pregnant, and we learn the story of her mother's pregnancy. Lily James plays the younger version of Donna and we even get some brief appearances by Cher, who plays Sophie's grandmother.