•On being the film's cougar (aka sexy older woman): "My daughter finally said two days ago, 'You're the cougar in this.' I said, 'Some of the press has been saying that. I don't know.' She said, 'Mom, being a cougar is a cool thing.' I am delighted to be a cougar as long as I possibly can be."
•About Tanya's youthful paramour (British actor Philip Michael): "He is a delightful guy. I think he's a very serious practicing Christian. He's also a karate champ. The scene I do with him on the beach is one of the highlights of my career."
•Favorite ABBA song: "Dancing Queen". "Because it's the ultimate in girl power."
•Current project: Plays a peevish French housekeeper in the Tony-winning Broadway farce "Boeing-Boeing".
•How you know him: As Mr. Darcy in the 1995 BBC miniseries of "Pride and Prejudice", and as another Mr. Darcy in the "Bridget Jones" movies.
•His "Mamma" role: Once known as "Harry Headbanger," now a stuffy British banker. "Harry is the one has languished in a suit and tie and a boring job for many years, having once had hopes of being a free spirit."
•Previous music experience: Basically none, save for the shower.
•On playing guitar during "Our Last Summer": "It's a hard thing to cheat. I would have rather just not bother with the guitar, otherwise."
•On his dance moves: "I have never felt there was any hope for me with freestyle. There is no style and it's never free. I always did much better with things that are a bit more formal. With disco dancing, I'm hopeless. But it didn't matter that much. They didn't cast Swayze, Travolta and Kevin Bacon."
•Dressing up in his disco outfit and rocker gear: "They were both embarrassing, but — shamelessly —actors are great, big mincing queens. It doesn't matter if you spend your life doing gangster movies. Part of you did this because we all just want to dress up and put makeup on. I love the idea of doing spandex. But it proved to be physically uncomfortable in ways you don't want to hear."
•Favorite ABBA song: "It tends to be the one you're listening to. We have years and years of associations with the songs. I actually was punched in a discotheque with "Dancing Queen" playing in the background. That's just one of the associations."
•Next: "The Accidental Husband" with Uma Thurman; Easy Virtue, based on a Noel Coward play; "Genova", directed by Michael Winterbottom.
•How you know her: As Mrs. Weasley in the "Harry Potter" series.
•Her "Mamma" role: Rosie, a cookbook author. "Rosie is down-to-earth. She is loyal, loud and funny, an extrovert who loves life. She missed the boat a bit with men."
•Previous music experience: Early on, she did a cabaret act in Liverpool pubs and TV variety shows. Appeared in 1991's "Stepping Out" as Liza Minnelli's testy tap-dance student, and taught ballet in 2000's "Billy Elliot".
•Why she did "Mamma Mia!": "An agent rang me up and asked, 'Would you like to be in "Mamma Mia!?"' I said, 'I can't do the "West End".' He said, 'No, the film. You play Meryl Streep's best friend.' I said, 'Yes, absolutely, I want to be Meryl's friend. But do I get any love scenes with Pierce Brosnan?' "
•On meeting Streep: "I was completely shy. She is such an icon. But she is a proper actor, not all starry or haughty. She is phenomenally energetic and creative, and we had good fun in Greece."