Celine Dion is pregnant with an embryo that was frozen for eight years, her fertility doctor revealed.The singer has revealed she is expecting her second child with husband Rene Angelil - a little brother or sister for the couple's eight-year-old son Rene-Charles.And fertility specialist Dr. Zev Rosenwaks has revealed he implanted an embryo in the 41 year old's womb that had been frozen in liquid nitrogen since the in vitro fertilization that helped her conceive Rene-Charles.