David Bowie's son is set to become a father for the first time.

Posting a picture on Twitter of a pregnant cartoon character with an umbilical cord sticking out of its stomach, Duncan wrote: "1 month since dad died today. Made this card for him at Christmas. Due in June. Circle of life. Love you, granddad (sic)."

His wife Rodene Ronquillo - who he married in 2012 - retweeted his message and quipped: "Shame on those of you who just thought I was really fat and didn't say anything. HAHA. ;) (sic)."

Film director Duncan is David's eldest child and his mother is the musician's former wife Angie Bowie.

Duncan and Angie have been estranged for over 30 years, ever since her divorce from David in 1980.

She recently said: "I said to him at the time I will never fight you for custody.

"David and his father were this close. Now what kind of a person would I be if I used my son as a weapon in my tool belt during that divorce? Is that not disgusting behaviour?'

"I'm sorry, I don't really have much else to say about it, that's how I feel about it and it hurts me, and when something hurts me, I put it in something in the back of my head and I close the door. You can ask me till you're blue in the face and I will say, 'yeah whatever'."

David also has daughter Alexandria 'Lexi' Zahra Jones, 15, with his second wife Iman.