By Christina Shanahan
Updated May 01, 2013 @ 7:30 am
Little White Dress
Credit: Allen Berezovsky/WireImage; Courtesy Photo

Ahna O'Reilly stepped out for a good cause in this quintessential Little White Dress at the second annual Hilarity for Charity event in Hollywood, which raised funds for the Alzheimer's Association with laugh-out-loud performances by comedians like Mindy Kaling and Seth Rogen. The look is Juicy Couture's Scallop Lace dress, also available in black and clementine versions, for $268 at Pssst: Scoop up the flirty frock now—it's on sale for $190!

Plus, shop more great celebrity looks.