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7 December 2013, 19:52
Check out full highlights from the boys' live webchat just hours before they played this year's event.
Union J chatted to Capital FM all about playing the Jingle Bell Ball 2013, going out on tour across the UK and launching their debut studio album in our exclusive webchat earlier today (7th December).
The 'Carry You' four-piece answered fan questions as part of their webchat, and highlights from their interview are now available to watch.
Union J join the likes of Katy Perry, Tinie Tempah, Ellie Goulding, Disclosure and James Arthur on the Jingle Bell Ball night one line-up.