Jessie J shows off plenty of flesh in two transparent outfits at Oxford Street Christmas lighting ceremony

Forget bodysuits, it looks like sheer outfits are fast becoming Jessie J's signature style.

After turning up to turn Oxford Street's Christmas lights on in a sheer top and red trousers, the singer then changed into a sheer black dress to perform on the iconic London street.

Posing on the red carpet alongside James Arthur and Conor Maynard, Jessie unusually decided to wear a nude bra under the transparent top, rather than a black one.

Wouldn't a black bra have been better? Jessie J shows off her toned physique in sheer long-sleeved top and red trousers before switching on the Christmas lights on London's Oxford Street

Working it: Jessie changed into a black halterneck dress with transparent skirt to perform

When it came to warming up the crowds, the 25-year-old then changed into a black halterneck dress with sheer skirt to perform Price Tag and new single Thunder.

She admitted she was finding it terrifying performing on such a high stage, but managed to get through the ordeal without a hitch.

Jessie was joined at the switch-on by James, Conor and radio DJs Lisa Snowdon and Dave Berry.

Hold tight: Jessie admitted she was terrified about performing from such a great height

Co-ordinated: Jessie poses with fellow performers James Arthur (left) and Conor Maynard (right)

Thousands of shoppers brought the iconic London shopping thoroughfare to a standstill to watch the concert and the lighting.

Jessie tweeted following the gig: 'I did it! I performed on a stage really high up! I faced my fear! Thank you SO MUCH to everyone who came out and sang with me and made it less scary! #xmaslights #selfridges #oxfordstreet.'

Following the concert on the roof canopy of Selfridges department store, Jessie headed into the furniture department, where she enjoyed a lie-down on one of the bed.

One, two, three... Jessie, Conor, James, Lisa Snowdon and Dave Berry switch the lights on

Excitement: Jessie performed her new single Thunder to the delight of the crowd

Posting a photo on Instagram, she wrote: 'Just chilling after the performance waiting for the lift #tempurmattress'sarecomfy #toodresseduptoshop #calmdownjess #justgohome #showsover.'

X Factor 2012 winner James was equally pleased to be here, tweeting: 'Real pleasure being on a bill with the very cool @ConorMaynard and one of my idols @JessieJ #LOVE #CHRIMBOLIGHTS.'

Meanwhile, when he wasn't performing to the crowds on Oxford Street, James was trying to make peace with The Wanted.

It appears the chart newcomer offended the group when he tweeted last week: 'F**k boybands! Bring on the hate I don't wanna be popular. Apart from JLS who are genuinely the coolest people I've met in music.'

She's not shy! Jessie's top clearly showed her nude coloured bra

Here come the boys: James and Conor also performed during the ceremony

Following James's online outburst, Tom told New! magazine this week: 'We've met him a couple of times and he's always been really nice. It's a bit of a kick in the teeth.'

After reading Tom's comment, James tweeted on Tuesday night: 'So every boyband in the world is gunna take offence to a comment I made in anger? Tom from the wanted I have nothing against you bro #LOVE.'

When one Twitter followed pointed out how nice The Wanted were, James agreed: 'They are I met them at northeast live and they were cool.'