Pierce Brosnan admitted he was "terrified" to sing in Mamma Mia!, but two of his costars alleviated some of his worries. "It's not an easy song to sing, and I was mildly terrified," Brosnan shared. "I ...

Stellan Skarsgård, from left, Pierce Brosnan and Colin Firth appear in a scene from "Mamma Mia!" Not even the top-tapping tunes of ABBA can unleash the "Dancing Queen" in everyone. Christine Baranski, ...