James Rothschild is a married man. He married Nicky Hilton, who is an American fashion designer, socialite, and model. The couple began dating in 2011 after they met at James Stunt and Petra Ecclestone's wedding.
On August 12, 2014, on vacation at Lake Como in Italy, the couple got engaged at a cocktail party celebration, hosted at Spencer House, owned by Charles Spencer, 9th Earl Spencer and brother of Diana, Princess of Wales. The current tenant is Jacob Rothschild, 4th Baron Rothschild.
They became husband and wife on July 10, 2016, at The Orangery in Kensington Palace Gardens in London, England, where Hilton wore a $77,000 Valentino Haute Couture gown and her sister Paris Hilton attended as maid of honor.
The marriage celebration included family and guest like Chelsea Clinton, Thomas van Straubenzee, Crown Princess Marie-Chantal of Greece, Crown Prince Pavlos of Greece, Kate Beckinsale, Julia Koch, Somers Farkas, Harry LeFrak, Anne Hearst, Jay McInerney and other more celebrity. The couple went to Botswana for their honeymoon. They are parents to Lily Grace Victoria Rothschild, born on July 8, 2016.