When Real Housewives of Beverly Hillsstar Kyle Richards’ ex Mauricio Umanskywas spotted kissing Nikita Kahn at an airport on July 17, fans assumed his marriage to Richards was officially over. Now, Umansky has been spotted once again with Kahn, as TMZobtained photos of the duo walking along the beach on August 17. Kahn donned a bikini, while Umansky strutted around shirtless with a bathing suit on. Not one to shy away from PDA — given their last photos that were released — the pair were spotted holding hands on the sand. While in the water, Kahn straddled Umansky, and it looked as though went …