You may remember her from dramas like The Lovely Bones and Atonementthe role that scored her an Oscar nomination at 13!—and, now 18, Saoirse Ronan (“pronounced ‘SIR-shuh,’ like ‘inertia,'” she says of her Gaelic name) is still casting her charming spell on screen and off. “I’m old enough to have a Guinness in Ireland, but what I really want is a driver’s license so I can get an ’80s BMW like my dad had,” the Irish actress told us when she posed in this season’s most bewitching looks (like this satin Reed Krakoff dress) for InStyle’s Oz-covered March issue. Up next, you’ll see her in the big-screen adaptation of Stephenie Meyer’s sci-fi thriller, The Host, in theaters March 29th. “There’s a lot of kissing with co-stars Max Irons and Jake Abel, which sounds a bit sleazy, but it’s only because I’m playing two characters,” she says. “At least that’s the excuse I’m going with.” To find out more about Ronan, flip to page 532 on InStyle‘s March issue. On the go? Download it on your tablet!

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