The wow factor: Little Mix get a red carpet make-over and switch their casual fashion style for some grown up glamour

Looking good: Tulisa Contostavlos (centre) with Little Mix (left to right) Leigh-Anne Pinnock, Jade Thirlwall, Jesy Nelson and Perrie Edwards arriving for the UK premiere of The Twilight Saga at the Westfield Stratford City

Back in the day: Little Mix on the X Factor wearing their normally casual outfits

They have a good teacher: Tulisa looked great in an all black ensemble combining leather and feathers, while Xtra Factor host Caroline Flack wore a velvet playsuit

The Xtra Factor: Janet Devlin, Misha Bryan and Amelia Lily also attended but were without mentor Kelly Rowland