Kate Middleton, who is perhaps the most famous pregnant lady in the world right now (sorry, Kim), has managed to keep her baby’s due date a closely-guarded secret for months. However, reports are now coming in that she’s due July 13th, which falls smack in the middle of the Queen’s Coronation Festival.

When it was revealed last year that Kate was pregnant, thousands were overjoyed as many had been waiting for the news since she married Prince William. But the Palace wasn’t so happy, as they had to make the announcement before they were ready due to Kate’s stay in the hospital for severe morning sickness. Now, a friend of the family’s has leaked the due date to The Daily Mail, and although the Palace has said that her due date would be in mid-July, they might not be so happy to find out the date was leaked.

The “source” said that the date was extracted from a conversation recently overheard at a party.

“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 July 13. Everyone was very excited,” the source said.

If the due date is accurate–and if Kate doesn’t pop early–the baby will be arriving right in the middle of a festival held for the Queen to mark 60 years on the throne. We can’t imagine she’d mind too much, however.