The Queen is to make a guest appearance in children's hit cartoon Peppa Pig - when the cute porker visits Buckingham Palace.
And the royal guest star is even seen joining in Peppa's favourite activity, donning her wellies and jumping in muddy puddles.
The show - to be screened next month - is designed to get young viewers involved in Jubilee activities.
The Queen's appearance marks the first time a human character has featured in the series.
In the episode, Peppa's pal Miss Rabbit is selected to receive an award for her hard work and brings along her friends to the palace for her once-in-a-lifetime experience.
The edition will be screened on Channel 5's Milkshake! strand on June 4, and there will be a Jubilee party in the studio. It will also be screened on Nick Jr later that day and released on DVD a few days earlier, on May 21.
A book based on the episode, entitled Peppa Meets The Queen, is being published by Ladybird.
Peppa Pig producer Phil Davies said: "As a British production, it's only fitting that Peppa Pig pays tribute to the Queen and we couldn't resist the opportunity to put her into the show.
"We hope that everyone enjoys watching the episode as much as we enjoyed making it and that it gets children into the Jubilee party spirit."
It will be the first of a series of new Peppa Pig episodes. The programme's website, www.peppapig.com, will also feature Jubilee party activities.