ET is in Greece this week with the stars of 'Mamma Mia!' -- watch our video to find out what goes into an ET location shoot!

In the Broadway smash-turned-big screen musical, Amanda Seyfried stars as a blushing bride who invites three men to a Greek island -- all of whom could be her father! Meryl Streep stars as the mother of the bride, while Pierce Brosnan, Colin Firth and Stellan Skarsgard co-star as possible papas. The movie musical, which hits theaters on July 18, takes its music from hit '70s band ABBA.