Publishing scion James B. Fairchild has moved on from his marriage to real-estate broker Whitney Fairchild. Sources tell Page Six that James, a designer and former Ralph Lauren VP of menswear, has been dating Dr. Christine Borelli, an accomplished neuropsychologist and mother of three. Sources say the couple met at their children’s school and recently moved in together in Sag Harbor. James and Whitney — who were likened in a breathless 1994 wedding announcement to a modern-day “Zelda and F. Scott Fitzgerald” — filed for divorce after 17 years of marriage in 2011, but the split has yet to be finalized. Proceedings were held up by a battle over their high-end store in Southampton.