Monaco's restless PRINCESS STEPHANIE has a new boyfriend, French real estate developer JEAN-YVES LE FUR. In an interview with the French magazine Paris Match, Stephanie disclosed that when she and Le Fur, both 25, met last September at the home of mutual' friends, "it was love at first sight." Stephanie, a would-be actress and recording star, swimsuit designer and perfume endorser, says she'll keep her house in Los Angeles, where her previous beau, record producer RON BLOOM, is working on her long-expected album. Stephanie, however, plans to be spending most of her time closer to Le Fur. She says, "My heart is now in Paris."