Winona Ryder isn't the only celeb with sticky fingers. A host of TV stars have been enjoying five-finger discounts too. Skin-care products from boscia -- a leading supplier to the bathrooms and boudoirs on the sets of such shows as Friends, Will & Grace, Gilmore Girls, and Sabrina, the Teenage Witch -- have been mysteriously vanishing. ''It's funny to get a phone call asking for more product,'' says boscia general manager Caren Conrad. ''I ask why, and they always say, 'It just keeps disappearing. I guess the [actresses] have been having fun again.''' The most popular ''lost'' products? The Antioxidant Recovery Treatment C, the hand lotion, and the Willow Bark Breakout Treatment, which non-TV stars can find at select Nordstrom locations, NYC's Henri Bendel, and boscia.net. ''We don't mind replenishing the sets,'' adds Conrad. ''At least [the actresses] all have great skin on hiatus.''