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Swift opts for a dramatic look in a black Elie Saab gown, which has thigh-high sheer panels in the skirt, for the event which is also attended by her ex Harry Styles and his band One Direction.
The former 'X Factor' contestants are seen having recording session and dance rehearsals in the video which features their mothers.
Little Mix take their fans to get a closer look at their journey from the 'X Factor' audition room to the finale night.
Coming in second place, Marcus Collins admits that the girlband deserve the champion title as saying, 'They're amazing.'