Everyone does jewelry for Christmas, gentlemen. Why not mix things up this year by sliding something a little naughtily nice into your girl's stocking instead? Take yourself over to Koko Ri in west Buckhead (43 Irby Ave., 404-812-6800) and pick up a set of Euclid lingerie by designer Sami Martin Sarmiento. The panties are sweet and sexy at the same time, with satin string ties on the sides and ruffled chiffon on the bottom, while the bras provide peek-a-boo gentility in matching stretch silk chiffon up top. Thin but comfy, Euclid is definitely designed more for the boudoir than the gym, but she'll be in the company of Lauryn Hill and Nicky Hilton when she wears it! At $120 a set, you'll be getting champagne kisses without the caviar credit card slip, too.