Christmas came early in the UK as a collection of some of the biggest pop stars performed at London's O2 Arena as part of radio station Capital FM's Jingle Bell Ball. The Saturday show was headlined by Katy Perry and on Sunday, Lady Gaga was the main attraction. BRITs Critic's Choice nominee Sam Smith took the stage alongside hit makers, Disclosure, whose album hit Number 1 earlier in the year. The duo says their rapid rise to fame still hasn't sunk in.
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