On 19 November 2010, Judd appeared on and won a special Strictly Come Dancing episode for Children in Need, where he partnered Ola Jordan and beat Rochelle Wiseman from The Saturdays.
On 6 September 2011 it was announced that Judd would take part in the 2011 series of Strictly Come Dancing. In the launch show of the series on 10 September, his professional dance partner was revealed as Aliona Vilani. His performances were well received by the show's judges, and his scores landed him in the top half of the leaderboard each week. On 22 October Judd received the first 10 score of the series, from judge Alesha Dixon. On 26 November he received the highest score of this series which was 46 out of 47 (including 3 tens for his first dance and the top score for the swingathon). On 17 December he and Vilani won the series final at Blackpool's Tower Ballroom.
| Week # | Dance/Song | Judges' scores | Result | ||||
| Horwood | Goodman | Dixon | Tonioli | Total | |||
| 1 | Cha-Cha-Cha/"Moves Like Jagger" | 6 | 7 | 8 | 7 | 28 | No Elimination |
| 2 | Foxtrot/"Just the Way You Are" | 6 | 6 | 8 | 7 | 27 | Safe |
| 3 | Jive/"Greased Lightnin" | 8 | 8 | 9 | 8 | 33 | Safe |
| 4 | Waltz/"Come Away With Me" | 8 | 8 | 10 | 9 | 35 | Safe |
| 5 | Tango/"Psycho Killer" | 8 | 7 | 10 | 9 | 34 | Safe |
| 6 | Samba/"I Wish" | 8 | 9* | 8 | 8 | 33 | Safe |
| 7 | Argentine tango/"Asi se Baila el Tango" | 9 | 8 | 10 | 10 | 37 | Safe |
| 8 | Salsa/"I'm Still Standing" | 8 | 8 | 9 | 9 | 34 | Safe |
| 9 | Quickstep/"Don't Get Me Wrong" | 9 | 10 | 10 | 10 | 39 | Safe |
| Swing Marathon/"Chattanooga Choo Choo" | Judges Awarded 7 Points | 46 | |||||
| 10 | Rumba / "(Everything I Do) I Do It For You" | 9 | 9 | 9 | 9 | 36 | Safe |
| 11 | Viennese Waltz / "This Year's Love" | 9 | 10 | 10 | 10 | 39 | Safe |
| Charleston / "I'm Just Wild About Harry" | 9 | 10 | 10 | 10 | 39 | ||
| 12 | Quickstep | 10 | 10 | 10 | 10 | 40 | Safe |
| Showdance | 9 | 9 | 10 | 9 | 37 | ||
| American Smooth | 9 | 10 | 10 | 10 | 39 | Winner | |
| Argentine Tango | 10 | 10 | 10 | 10 | 40 | ||
*In Week 6, actor and winner of Season 11 of the U.S. version of Dancing With the Stars Jennifer Grey filled in for Len Goodman, who was on holiday.
On 23 March 2012 Judd performed again in BBC's "Strictly Come Dancing Underwater", as part of Sport Relief 2012, and was narrowly beaten by Chelsee Healey.
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