Robert De Niro and his wife Grace Hightower have separated after more than 20 years. According to Reuters, anonymous sources said the pair have been living apart for some time. The two got married in 1997 and have two children together. A source close to the family said that ?sometimes things don?t work out the way you hope or want them to.? While De Niro is a well known respected actor he tends to keep his family life private.