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The British group is in the middle of performing a song when the former Disney star appears onstage dressing up as a snowman and shows hilarious dance moves.
Pinnock, whose group is currently on a tour with Demi Lovato, says that a microphone belongs to Fifth Harmony falls and lands on her head during a rehearsal.
In the fun clip, the British all-girls group hits the gym with some famous faces incuding Mel C, Arlene Phillips, Olympic cyclist Victoria Pendleton and Olympic gymnast Louis Smith.
Along with British singer Cher Lloyd, the two all-girls groups from 'The X Factor' will serve as the opening acts on Lovato's upcoming Neon Lights tour.
The British all-girls group is performing their hit song, 'How Ya Doin'?', when Sprite bottle flies to the stage and almost hits Pinnock's face.
The first group to win U.K.'s 'X Factor' is now focusing on tracks for the follow-up to 2012's 'DNA'.
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.'