By Selena Hill (staff@latinospost.com) | First Posted: May 13, 2013 05:08 PM EDT

Kate Middleton's mystery due date has finally been revealed: The Duchess is expected to give birth Saturday, July 13, which falls in the middle of Queen Elizabeth's Coronation Festival.

According to The Daily Mail, the royal's birth due date of July 13 clashes with the Coronation Festival, a four-day celebration of the Queen's 60 year reign which began 16 months after being proclaimed Monarch on her father's death.

An inside source told The Mail that "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."

On the other hand, sources told E! News that the Duchess of Cambridge is expected go into labor on July 14. Either way, there's a good chance that she and Prince William will be absent from the Coronation Festival which runs from July 11 to July 14.

Opera singer Laura Wright, who will perform during the festival, quipped, "I had better not sing too many high notes .  .  . what if my singing made her go into labor?"

The baby will be delivered in the private Lindo Wing of St Mary's Hospital in Paddington, the same place William was born, and under the supervision of Royal gynecologists Alan Farthing and Marcus Setchell.

Since Princess Diana was born on July 1, there's also a chance that the baby will be born under the same cancer star sign as Diana, who was an avid astrology follower.

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