She gave birth to her first child on July 31. And on Thursday, Nikki Bella was seen taking baby son Mateo for a walk in his stroller accompanied by fiance Artem Chigvintsev. Doting parents: Nikki Bella and fiance Artem Chigvintsev were seen taking baby son Mateo for a walk in his stroller in LA's Studio City neighborhood on Thursday Nikki …
