David Bowie learned he was to be a grandfather shortly before his death

David Bowie would have been a grandfather come June.

Bowie's eldest son, Duncan Jones, announced Wednesday that he and his partner Rodene Roquillo were expecting a child, and that they had told the news to Bowie at Christmas, a month before the singer's death.

Jones, a filmmaker and the only child from Bowie's marriage to his first wife Angie Bowie, revealed the news in a tweet featuring the card he made for Bowie. The card has an illustration of an unborn child with the words, "I'm waiting."

"1 month since dad died today," Jones wrote in the tweet. "Made this card for him at Christmas. Due in June. Circle of life. Love you, granddad."

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Roquillo followed up the announcement with a cheeky tweet of her own, saying, "Shame on you who just thought I was really fat and didn't say anything."

Bowie's widow Iman offered congratulations to the couple on Twitter, continuing her return to social media after a brief respite following her husband's death in January.

Jones and Roquillo's child would be Bowie's first grandchild.

The musical icon behind hit songs such as Heroes, Changes and Space Oddity, Bowie died at the age of 69 on Jan. 10 after an 18-month battle with cancer. He had released his final album, Blackstar, days before his death. He was survived by his wife, Imam, and his two children, Jones from his first wife and Alexandria from Iman.