Model-actress Natalia Vodianova and her British property-heir husband, Justin Portman, have been spending less time together, sources say.They married in 2001. But insiders are buzzing that Russian beauty Vodianova, a face of Dior, was spotted walking in Paris fashion week shows last week, as well as attending others with their three children, without Portman, who usually goes to shows with her but was at their house in Uruguay. A rep for Vodianova says, “They are still married. She is traveling and very busy with her career.”