Mamma Mia! Only ET is with the stars of this summer’s most anticipated musical, and only ET’s Jann Carl is soaking up the sun in sunny, picturesque Greece with Pierce Brosnan and Amanda Seyfried!

"I was nervous; [but] when I actually got down to it, it was very easy in some respects," Pierce tells Jann about having to sing on camera. "I spent six weeks listening to my iPod and driving my kids nuts and my wife nuts and the family and the dog and everybody nuts, you know, just singing these songs."

In theaters July 18, ‘Mamma Mia!’ stars Meryl Streep as an independent, single mother whose spirited daughter (played by "Big Love" star Amanda) is getting married — and is determined to learn the identity of her true father so he can walk her down the aisle. Pierce, Colin Firth and Stellan Skarsgard are the three contenders, all of whom were involved with Meryl’s character 20 years earlier when they visited her Greek island paradise. Inspired by the incredibly catchy music of Abba and based on the hit musical that toured the world, ‘Mamma Mia!’ features such sing-along classics as "Dancing Queen," "Knowing Me, Knowing You," "SOS" and "The Winner Takes It All."

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