By Emma Wilson Natalie Portman stunned in a show-stopping revenge dress after quietly confirming her split from husband Benjamin Millepied. The 42-year-old Oscar winner showed her estranged husband what he was missing as she arrived for an appearance on JImmy Kimmel Live, as she strutted across the studio lot in front of waiting photographers. Natalie looked sensational in the black strapless mini dress which featured a sheer black bralette underneath, which she teamed with sky-high black heels. It marks a new beginning for the mother-of-two, who has laid low since cheating allegations rocked …