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Published 16:57 16 Jun 2017 BST
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He's been on a few times and always entertains, from telling stories to delighting on flipping people off the big red chair, so we can expect plenty of craic on the couch tonight.
Mark Mark appears to enjoy the visits as much as we do, particularly the infamous one where he was drunk.
You can relive that hilarious episode here.Explore more on these topics: