CHRISTINA AGUILERA won`t have any trouble finding a new man in this form. The pop warbler will have singletons dripping hot under the collar with the latest ad for her aptly-named fragrance Royal Desire. Divorcee-to-be Christina evokes fond memories of screen siren MARILYN MONROE in the sizzling pic - a far cry from her bedraggled appearance in LA yesterday. The singer was in defiant spirits as she wandered around town in a flat cap, shades, leather jacket and a T-shirt emblazoned with the message: "Girls Just Wanna Have Fun!" Either she`s making a veiled reference to her newly single status.