A musical using ABBA songs shimmies its way to the silver screen? How could Meryl Streep say no? (That's printed sarcasm, by the way.) Streep plays Donna, a former pop star whose daughter wants to know who her real daddy is. So she invites three of mom's former bed buddies to her wedding. Mamma Mia!,indeed. Charming shenanigans—involving Colin Firth and Pierce Brosnan—ensue.108 minutes PG-13.