Little Mix perform at their first concert

They’ve only been pop stars a month after winning The X Factor last month.

But Little Mix made the transition to bona fide chart idols last night as they performed their first concert.

The four-piece joined fellow X Factor alumni Alexandra Burke, The Saturdays, Chipmunk and Dionne Bromfield at a charity gig in London.

Each wearing pink accessories and lipstick to embrace the theme of the Tickled Pink Girls’ Night Out gig at the Shepherd’s Bush Empire, the foursome performed several songs, including their No.1 single Cannonball.

While Little Mix’s stage outfits were clearly to see as they left the venue, The Saturdays were taking great pain to cover there’s up.

Perhaps feeling bashful, or maybe they had forgotten their coats, Mollie King and Rochelle Wiseman left the Empire wearing white dressing gowns.

But when a fan stopped King to ask for a photo, her gown fell opening, showing her silver dress underneath.

The concert was hosted by Burke, who is an ambassador for the Breast Cancer Care charity.

It’s a cause close to her heart after her aunt Jean died from the disease three years ago.

Burke said recently: ‘My auntie Jean had breast cancer. She died in my arms in hospital. We were there for her very last moments.

‘I really do this because of her. It was a life-changing moment for my family. I just want to do my part to give back.’