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According to The Mirror, the former hosts will appear on Monday alongside current presenters Phillip Schofield and Holly Willoughby.
A source said: "Richard and Judy presented the show for so many years that it seems natural that they should come on to celebrate a landmark birthday. But when their chatshow flopped, they said they wouldn't do more TV together.
"Their appearance on the This Morning sofa could be their last one on screen as a couple. Fans will also be interested to know what they are up to now."
Show bosses are also said to want to include a pre-recorded video message from ex-host Fern Britton in the landmark broadcast.
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