Tulisa may have won FHM"s Sexiest Woman in the World but she can"t hide her frumpy underwear

That's not a good look! Tulisa may have won FHM's Sexiest Woman in the World but she can't hide her frumpy underwear

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UPDATED:

23:49 GMT, 1 May 2012

She's been voted as the sexiest female on the planet by FHM magazine readers but they clearly hadn't seen Tulisa Contostavlos in her day-to-day underwear.

The 23-year-old star was spotted showing off a pair of baggy-looking white cotton knickers as she signed autographs for fans yesterday.

However, onlookers probably didn't notice the fashion faux pas as the N-Dubz singer was also wearing a pair of garish trousers, which were teamed with a pair of neon yellow heels.

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Caught out! Tulisa accidentally showed off her white frumpy underwear as she greeted fans yesterday

Caught out! Tulisa accidentally showed off her white frumpy underwear as she greeted fans yesterday

Caught out! Tulisa accidentally showed off her white frumpy underwear as she greeted fans yesterday

The headache-inducing trousers included splashes of orange, yellow, green and blue.

And her bizarre facial expressions appeared to mimic how passersby would have looked as she seemed to wince while walking in to the BBC Radio 1 studios this morning.

Tulisa, 23, turned up to the studios to record the Live Lounge with presenter Fearne Cotton.

And it's a good job she was only appearing on the radio waves and not on TV screens with the shocking ensemble.

Standing out: The N-Dubz star and X Factor judge knew she'd only be heard and not seen as she recorded a slot on Fearne Cotton's Live Lounge radio show

Standing out: The N-Dubz star and X Factor judge knew she'd only be heard and not seen as she recorded a slot on Fearne Cotton's Live Lounge radio show

The N-Dubz star even matched the bright bottoms with a pink vest top, as well as a denim jacket which had black leather sleeves.

She trotted out of the venue in the neon peep toe heels as she pulled the odd faces.

And she even flashed her underwear as she turned around and signed autographs for fans on her way to her car.

Contostavlos appeared on the show to promote her solo music, and Fearne was clearly excited to have her on the show.

So much going on! The singer matched the garish trousers with neon peep toe heels, a pink top, as well as a denim jacket with leather sleeves

So much going on! The singer matched the garish trousers with neon peep toe heels, a pink top, as well as a denim jacket with leather sleeves

So much going on! The singer matched the garish trousers with neon peep toe heels, a pink top, as well as a denim jacket with leather sleeves

She wrote on Twitter this morning: 'Today Tulisa in the live lounge at 1140am #radio1.'

And it was a far cry from how Tulisa dressed while she spent time in America earlier this year.

The singer ensured she looked her best in a series of pretty dresses, while she also underwent a makeover when she appeared on The X Factor last year, going from chav to slick TV judge.

During her appearance, Tulisa covered David Guetta's club hit Titanium and admitted she was feeling 'nervous' ahead of taking to the mic.