PICTURES! Tulisa joins Little Mix at The X Factor live tour at the O2

Tulisa Contostavlos (X Factor)

X Factor judge Tulisa stopped by to show's live tour last night, hanging out her "little muffins" Little Mix backstage.

It was the third performance for the group and their fellow finalists at London's massive O2 Arena, and one of their last tour dates as the concert draws to a close later this week in Cardiff.

Tulisa tweeted: "Me and my girls @LittleMixOffic I'm so proud off these lil muffins!"

Tulisa and Little Mix X Factor live tour

Little Mix have been joined by nine other of last year's finalists on the show, which has already played to well over 200,000 fans in the UK and Ireland since kicking off in Manchester over a month ago.

The group finish the tour this Friday at Cardiff's Motorpoint Arena.

Browse our gallery from the X Factor 2012 live tour below..

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