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The highly anticipated arrival of the royal baby could come in the middle of Queen Elizabeth's four-day Coronation Festival this summer, according to a report.

A friend of the Duke and Duchess and Cambridge told the Mail on Sunday that Kate Middleton's official due date is July 13.

If true, that means the future king or queen would be born the middle of the Queen Elizabeth's Coronation Festival, which is scheduled from July 11-14. The four-day extravaganza will celebrate 60 years since the monarch was crowned.

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

After Middleton's pregnancy was announced in December, bookies began taking bets on whether the royal baby might share a birthday with Princess Diana, who was born on July 1.