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Kate Middleton baby may arrive during queen's Coronation Festival

Britain's Prince William stand next to his wife Kate, Duchess of Cambridge as she leaves the King Edward VII hospital in central London, Thursday, Dec. 6, 2012. Prince William and his wife Kate are expecting their first child, and the Duchess of Cambridge was admitted to hospital suffering from a severe form of morning sickness in the early stages of her pregnancy.

May 12, 2013 12:00:00 AM PDT
Kate Middleton's baby may steal some of the spotlight during this summer's Coronation Festival for Queen Elizabeth II.

A friend of the Duke and Duchess of Cambridge told the Mail Online on Sunday that Middleton's official due date is July 13. If that is true, the royal baby would arrive in the middle of the four-day festival, scheduled July 11-14. The event celebrates 60 years of the queen's reign.

The Clarence House Press Office told ABC News they could not comment on the report but said "the baby is expected to be born in July."

There was earlier speculation that the baby could share a July 1 birthday with Princess Diana. Bookies even placed their bets after Middleton's pregnancy was announced in December.

ABC News contributed to this report.