Fiercely private Hugh, 54, made the unusually candid remarks during an interview with Swedish newspaper Nöjesbladet.
CLICK ON PHOTOS TO ENLARGE
Hugh Grant pictured with Anna Eberstein, the mother of his son
"I see him all the time, all the time – most days," he said. "I love him very much."
It was only revealed earlier this year that Hugh was a father to the little boy, who turned two last week, with Swedish TV producer Anna.
It transpired that she had been pregnant at the same time as Tinglan Hong, the mother of Hugh's other two children.
Hugh Grant is a proud father of three
Hugh and Tinglan welcomed a daughter Tabitha in September 2011, and a son named Felix in December 2012.
Both mothers are thought to live within walking distance of the star's home in Fulham, London.
Hugh confirmed he is no longer romantically involved with Anna, but said, "We are very good friends and she's a very good mother."