Robert De Niro went public with his romance with a mystery woman as they enjoyed a day outon the coast of Côte d'Azur,Franceon his 78th birthday on Tuesday.The actor, who is in a bitter divorce battle with his estranged wife Grace Hightower, walked hand-in-hand with his partner while making their way down a rocky staircase - before the pair kissed on a luxury $200million yacht owned by De Niro's friend and business partner, billionaire James Packer.Robert looked happy and relaxed in the company of the woman as they supported each other while climbing down the walkway on a rocky cliff edge.They were also pictured together in New York in June and attended the Philbrook Museum of Art in Tulsa on July 31, in pictures which appeared on social.
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