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9 December 2012, 21:29 | Updated: 30 March 2016, 13:50
The Scottish DJ was outsmarted by a magician when he watched a card trick backstage at London's O2 Arena.
Calvin Harris played 'Chase The Lady' ahead of his performance at this year's Jingle Bell Ball and was shocked by four magic cards changing from the Nine of Hearts to the Queen of Spades.
"You're just beating me every time," he said, as he guessed the cards wrongly in every round of the game he played backstage with magician Katherine Mills.
His set on stage at the packed O2 Arena was much more successful than his card tricks, as the crowd went wild when he powered through his biggest hits including 'Bounce' and Vodafone Big Top 40 number one single 'We'll Be Coming Back'.
You can see more of Katherine Mills tricks by visiting her website or following her on Twitter .
Keep your eyes and ears on the ball by visiting our special Jingle Bell Ball area as we come live from this year's event across the weekend.
You can see all the latest news, pictures, interviews and watch this year's performances on Capitalfm.com - follow the action in real time on our live blog.
Join the conversation about this year's Jingle Bell Ball by following @CapitalOfficial on Twitter with the hashtag #CapitalJBB and liking us on Facebook.