WHEN GUNS N' ROSES GUITARIST SAUL Hudson, 27, better known as Slash, wed 27-year-old actress-model Renée Suran in Marina Del Rey, Calif., on Oct. 10, it was by rock standards a downright conventional affair. The groom wore leather, the bride wore while (including fishnet tights), and "the ceremony was very romantic," says one guest, "like in the movies." Or at least in a darn touching rock video.