The series nine champion triumphed as he returned to the ballroom along with five other former contestants, for the festive edition of the hit BBC show.
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Harry Judd and Joanna Clifton are the 'Strictly' Christmas champs
However, they had stiff competition from series six winner Tom Chambers and his partner Oti Mabuse, whose Charleston to ‘Santa Claus Is Comin’ To Town’ also scored full marks.
After being crowned winner when the judges’ scores were combined with votes cast by the studio audience, Harry told hosts Tess Daly and Claudia Winkleman: “It’s amazing, thank you so much everyone.
"I had the most amazing time and I just want to dedicate this to Joanne who has been an incredible teacher and an incredible dancer. Thank you and Happy Christmas!”
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A host of ex contestants returned to 'Strictly' for the festive special
Joanne added: “It feels amazing and I am so overwhelmed. Harry is an absolute natural and performed amazingly on the Christmas special.
“I want to say a massive thank you to him for being such a great dancer, partner, student and friend – he has made this experience such great fun for me. I am glad he can take home the Silver Star trophy and show his baby when it is born in January!”
Other stars who also returned for the show included 2013 champ Abbey Clancy, whose Waltz with Brendan Cole to ‘When I Fall in Love’ scored 39, and series six finalist Lisa Snowdon, whose Quickstep with Pasha Kovalev to ‘Let it Snow’ earned them a respectable 37.
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Abbey Clancy's Waltz scored 39 out of 40
Series 11’s Alison Hammond and partner Robin Windsor also did a Cha Cha to ‘Celebration’ and scored 31, while ‘The People’s Strictly’ winner, former Royal Marine Medic Cassidy Little, returned alongside Natalie Lowe do to a Jive to ‘Cool Yule’, which scored 35.
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Alison Hammond was back on the floor in her usual colourful style
Shirley Bassey and vocal group Blake were also on hand to provide a musical interlude, with their single ‘The Christmas Song (Chestnuts Roasting On An Open Fire)’.
‘Strictly Come Dancing’ returns for a new series next autumn on BBC One.
16 Dream 'Strictly Come Dancing' Celebs
Nigella Lawson(01 of16)
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Dads up and down the country would be glued to their sets every Saturday night if this much-loved TV chef signed up for the show. (credit:Lou Rocco via Getty Images)
Danny Dyer(02 of16)
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Having the 'EastEnders' star's on-screen wife is great, but we all know it's really Mr Dyer we really want to see on the floor. (credit:Matt Crossick/Matt Crossick)
Sarah Harding(03 of16)
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Sarah might insist she's concentrating on acting and singing right now, but given the less-than-stellar reviews for her 'Corrie' appearance (not to mention her debut single), 'Strictly seems like a possible stop for the former Girls Alouder. (credit:Jo Hale via Getty Images)
Craig David(04 of16)
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He's got a music career to resurrect and he looks great with his top off. It couldn't make any more sense. (credit:Iconic via Getty Images)
Myleene Klass(05 of16)
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As one of the most omnipresent stars in celebville, we can't believe she hasn't done it already. (credit:Daniel Leal-Olivas/PA Wire)
Boris Johnson(06 of16)
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Because every series needs a public figure who is just hopeless on the dance floor. (credit:Carl Court via Getty Images)
Gemma Collins(07 of16)
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Well, let's be honest, she's done nearly every other reality series. (credit:Karwai Tang via Getty Images)
Richard and Judy(08 of16)
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With Richard's ego there's no way he'd take any nonsense from the judges, making him a dream contestant. Plus everyone knows there's no Richard without Judy, so his wife would have to join him on the show. (credit:Anthony Harvey via Getty Images)
Michelle Keegan(09 of16)
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The former 'Corrie' star would be able to get plenty of tips from her other half, as Mark Wright took part in last year's series. (credit:Doug Peters/Doug Peters)
Paddy McGuinness(10 of16)
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Let the dance see the floor! (credit:Mike Marsland via Getty Images)
Beverley Callard(11 of16)
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From the look of this picture, the wardrobe department wouldn't even have to make any outfits for Bev - she'd be able to bring in her own frocks. (credit:Doug Peters/Doug Peters)
Rio Ferdinand(12 of16)
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As a former England captain, he'd attract a load of male fans to the show, and would probably be quite a good dancer. (credit:Pierre Suu via Getty Images)
Susan Boyle(13 of16)
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We mean, who doesn't want to see Susan Boyle performing her trademark wiggle on the 'Strictly' floor? (credit:Danny Lawson/PA Wire)
Lee Ryan(14 of16)
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Surely it's only a matter of time before he follows in bandmate Simon Webbe's footsteps? (credit:Doug Peters/Doug Peters)
Mary Berry(15 of16)
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As the nation's favourite Grandma, she needs to do 'Strictly' for every Granny who's ever dreamed of being twirled around by Anton Du Beke. (credit:Ian West/PA Wire)
Sam Stanley(16 of16)
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The sports star would have been a pretty topical signing for the show, given he is the first rugby union player to publicly come out. (credit:David Rogers via Getty Images)