Look behind you! Little Mix's Jesy Nelson hits a bum note in exposing shorts as Leigh-Anne Pinnock whips out her tiny waist for Radio 1's live lounge

PUBLISHED: 12:54, 13 November 2012 | UPDATED: 14:14, 13 November 2012

There is no denying Little Mix's Jesy Nelson is an excellent singer, but her outfit choice on Tuesday hit a definite bum note.

Wearing suspender tights and tiny shorts the 21-year-old looked fabulous from the front, but when it came to walking up stairs Jesy couldn't avoid a slight wardrobe malfunction with her tights exposing a lot more than she bargained for.

As the girls posed up outside BBC's Maida Vale studios it was hard not to notice Leigh-Anne Pinnock's incredibly tiny waist in her small back top and gold detail jogging bottoms.

From the front... perfect: Little Mix's Jesy Nelson looks perfect as she poses up outside Maida Vale studios as her bandmate Leigh-Anne Pinnock shows off her enviable tiny waist

Unflattering: Jesy's outfit is less than chic from the back, as her top begins to ride up exposing her thighs

The four-piece are fresh back from Australia where they have been on a whistle-stop promotional tour for single Wings - and perhaps Jesy was dressing for the weather down under in her short outfit.

Curvy Jesy went for gothic look with some Dr. Martens, suspender allusion tights and a black lace detail top with her trademark 'love' slogan emblazoned across it.

Her curly brown hair hung in loose waves around her shoulders, while her bandmates Leigh-Anne, Perrie Edwards and Jade Thirlwall also opted for the dark colours, showing their effort to move into a more sophisticated market.

It's all about the midriff... apart from Jesy that is! Little Mix pose up as a passer by gets caught in the shot

Legs eleven: Jesy is the only one who braved wearing tights on the winter day with a lose top

The girls were outside the BBC studios to perform for Radio 1's live lounge.

And it seems their performance of DNA and a Mumford and Sons I Will Wait went down a treat, with them later tweeting: 'Thanks for having us on the Live Lounge @fearnecotton @bbcr1! We hope you enjoyed it! Xx Little Mix xx'

Their radio gigs comes after they performed on X Factor where former mentor Tulisa said her 'little muffins were all grown up', after winning the competition last year in an array of colourful outfits, the girls performed in matching black trousers, gold and blue tops with military jackets with ammunition belts.

Spread your wings: The foursome headed into the live lounge where they performed DNA and a version of a Mumford and Son song

Aren't you cold? Little Mix leave their jackets in the car as they head to the live lounge

After their set, Perrie admitted: 'We were so nervous.'

Speaking to host Dermot O'Leary on Sunday, Jade said: 'It been the best year ever. We've had so much fun. Thanks to the public for making us the winners.'

Since winning The X Factor last year, Little Mix have gone on to enjoy two No.1 singles - Cannonball and Wings.

DNA is their third single - their second original - from their upcoming album of the same name.

Glammed up her look: Jade Thirwal's purple locks look amazing outside Radio 1

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Tuesday, 13 November 2012

Little Mix photos for Radio 1's live lounge

Look behind you! Little Mix's Jesy Nelson hits a bum note in exposing shorts as Leigh-Anne Pinnock whips out her tiny waist for Radio 1's live lounge