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

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, Jesy Nelson, Jade Thirlwall and Perrie Edwards arriving for the UK premiere of The Twilight Saga at the Westfield Stratford City

Looking good: Tulisa Contostavlos (centre) with Little Mix (left to right) Leigh-Anne Pinnock, Jesy Nelson, Jade Thirlwall 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

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

They have a good teacher: Tulisa looked great in a all black ensemble They have a good teacher: Tulisa looked great in a all black ensemble

They have a good teacher: Tulisa looked great in an all black ensemble combining leather and feathers

Top presenter: Caroline Flack, in a velvet playsuit, was without her partner in crime Olly Murs

Top presenter: Caroline Flack, in a velvet playsuit, was without her partner in crime Olly Murs

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

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