The TV star announced the sad news on CNN this Monday, June 17.
"Gloria Vanderbilt was an extraordinary woman who loved life and lived it on her own terms. What an extraordinary life. What an extraordinary mom. What an incredible woman," he said.
Gloria, a fashion designer and heiress was 95 at the time of her death. Anderson, 52, said she had a very advanced form of stomach cancer, which spread earlier this month.