Simon Cowell's Royal Wedding Invitation: Lost in the Mail?

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Simon Cowell hasn't received his invite to the royal wedding yet -- did it get lost in the mail?
The "X Factor" judge and executive producer tells ET in an interview from London, "Well I'm literally going to get into a boat, into that river, go up to Buckingham Palace and ask where my invitation was, because it must have gotten lost in the [mail]."
But in all seriousness, the Brit says, "I think this is exactly the right time. We need something like this at the moment. It's been a bit gloomy the last couple of years, so this is going to lift everybody. Everyone's excited."
Prince William will wed Kate Middleton on April 29 at Westminster Abbey in London.