Jenner, 57, recently announced she and her husband, Bruce Jenner, had ended their marriage after 22-years together, reported New York Daily News.
The duo, who previously insisted they were just friends, were photographed at Barney's department store and made no attempt to hide the fact they were together, as the 30-year-old vineyard owner waved to onlookers.
Their public date came just days after Kris brought Ben to her future son-in-law, Kanye West's concert in Oakland, California.
After their shopping trip, Kris flew to Las Vegas to help her daughter Kim Kardashian celebrate her 33rd birthday.