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The Boyzone star will perform to his bandmate's solo hit 'When You Say Nothing At All', which was used in the Hugh Grant rom-com Notting Hill. The theme for this week's show is Songs from the Movies.
Hosts Phillip Schofield and Holly Willoughby revealed the news to Graham and Keating on This Morning earlier today.
"If he goes down on my song I will never hear the end of it! I'm going to be rattled on Sunday," joked Keating.
Graham and professional skater Melanie Lambert finished bottom of the judges' scoreboard last week with 13.5 points, but were saved by the public vote.
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