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Kate Middleton, Duchess Catherine

LEON NEAL/AFP/Getty Image

Mark those royal calendars, y'all!

Well, maybe mark 'em in pencil. A source tells E! News Kate Middleton is due July 14. (Alternatively, a source tells British tabloid Daily Mail, Prince William's wife is due July 13.)

"Some of Kate and William's closest pals were at a barbecue hosted by a family friend of the royals recently," the paper quotes a source as saying. "They were all discussing the fact that Kate's baby is due to be born on July 13. Everyone was very excited."

If this is indeed the correct due date, it falls in the middle of  the Coronation Festival, a four-day celebration marking 60 years since Queen Elizabeth II was crowned.

We also know, from Kate herself, that her due date is "around mid-July." The 31-year-old mom-to-be told reporters last month that even though she had a time frame, "babies have their own agenda."

Point being? Be on high alert the entire month of July!

—Reporting by Melanie Bromley