FACES TO WATCH NINA SIEMASZKO

Nothing if not precocious, Nina Siemaszko was only 13 when she attracted the attention of an agent for her older brother Casey (Young Guns, Stand by Me) by ''making fun of him.'' She not only charmed and won an agent, she got a career-though in mostly forgettable films (the highlight was playing Jeff Bridges' daughter in 1988's Tucker: The Man and His Dream). She still blushes remembering her boast-in the press materials for License to Drive, yet-that she wanted to be ''the new De Niro, only a woman.'' Now that she's all grown up, the 21-year-old Chicagoan is making sure everyone knows it by starring in erotic-film director Zalman King's Blue Movie Blue, due this year. Siemaszko admits she never saw King's much-ridiculed Wild Orchid until after she'd signed on for her role as a teenager who turns to prostitution in late-'50s central California. ''My interest was in doing something different because nobody ever viewed me as something even slightly sexual before,'' she says. To her surprise, she found she enjoyed doing the nude scenes. ''It was really exciting in a weird way because, with your clothes off, that's it-there's no hiding behind anything anymore,'' she says. Her family in Chicago is supportive, but she's afraid the city's Polish community, of which she has been an active member, ''is going to be a little flipped out.''