Britain's Catherine, Duchess of Cambridge's, baby is due on 13 July.
The duchess and her husband, Prince William, confirmed in December they’re expecting their first child together after she was hospitalised with severe morning sickness, but Buckingham Palace has so far only disclosed the new arrival will be born sometime in July.
However, friends of the couple have reportedly been overheard talking about the exact due date the duchess has been given.
A source told the Mail on Sunday newspaper: "Some of Kate and William's closest pals were at a barbecue hosted by a family friend of the royals recently. They were all discussing the fact that Kate's baby is due to be born on 13 July. Everyone was very excited."
The day falls in the middle of the Coronation Festival, a four-day celebration to mark 60 years since William's grandmother Queen Elizabeth was crowned, meaning the couple are likely to miss the celebrations which take place from 11 to 14 July.
Opera singer Laura Wright, who’ll perform in the gardens of Buckingham Palace, joked she’s worried her performance will trigger Kate's labour.
She said: "I had better not sing too many high notes .??.??. What if my singing made her go into labour?"
A royal spokesperson refused to confirm the report, saying only, "We have only said that the duchess is due in July. Anything further would be speculation."