Jessie J at the VIP Room in Paris. Photo: PA
As for her daytime look, the star dressed down (Jessie J style) in a cut-off sweatshirt, leather shorts and leopard print tights. One thing's for sure; she's never boring when it comes to style.
Let us know if you think Jessie's on stage look is hot or not and take a look at her front-row style in our fashion week gallery below.
- Sienna Miller at the Moet & Chandon party<p> Sienna Miller goes for glam in a slinky scale-covered number.</p>
- Mario Testino and Sienna Miller<p> Strike a pose!</p>
- Kate Moss<p> Kate Moss keeps off the night chill with a fur coat.</p>
- Jamie Hince, Mario Testino and Kate Moss<p> Husband and photographer join La Moss.</p>
- Rosie Huntington-Whiteley<p> You can pretty much see why she's the Burberry Body can't you?</p>
- Candice Swanepoel and Rosie Huntington-Whiteley<p> Candice tries to out-pose Rosie</p>
- Ellie Goulding<p> Ellie's fast becoming a Fashion Week fixture.</p>
- Georgia Jagger<p> Loving the splashes of red in the nail polish and lipstick departments.</p>
- Cara Delevigne<p> Fresh from modelling on the Burberry catwalk</p>
- Jade Parfitt<p> Oooh - what's in the bag?</p>
- Jasmine Guinness<p> Old school glam for Jasmine in a vintage Ralph Lauren Collection gown.</p>
- Matthew Williamson<p> The designer rocks a hat - and we do love a man who rocks a hat.</p>
- Kaya Scodelario<p> LFW is about as far away from Skins as you can get but Kaya fits right in.</p>
- Peaches Geldof<p> FASHION FAIL. Peaches did not get the monochrome memo.</p>
- Anna Wintour<p> And neither did The Bob. But she's The Bob, so she can wear whatever she wants.</p>
- Rosie Huntington-Whiteley<p> Burberry's current Body looked chic at the brand's show.</p>
- Sienna Miller<p> Not sure about the top but the bag is a winner in our eyes at Burberry.</p>
- Gemma Arterton at Burberry<p> Cute clutch!</p>
- Ellie Goulding<p> Popping pink for Ellie at Burberry</p>
- Rachel Zoe at Burberry
- Anna Wintour at Burberry
- Ben Kingsley and Daniela Lavender at Burberry
- Julia Restoin-Roitfeld at Burberry<p> Julia masters the coat-as-a-dress for Burberry.</p>
- Mario Testino at Burberry
- Kaya Scodelario and Elliott Tittensor<p> Loving Kaya's edgy look (and seriously considering stealing her shoes).</p>
- Philip Green at Burberry
- Poppy Delevigne at Burberry
- Donna Air at Burberry
- Lily Donaldson at Burberry
- Denise Lewis at Burberry
- Laura Robson<p> </p> <div style="font-family: Verdana, Arial, sans-serif; font-size: 10pt; line-height: 12pt; color: rgb(51, 51, 51); background-color: rgb(255, 255, 255); "> <p> The tennis player rocked a bit of a Kate Middleton-esque look at Burberry.</p> </div>
- Jacquetta Wheeler at Burberry
- Tali Lennox at Burberry<p> Private eye chic...</p>
- Caroline Sieber at Burberry<p> Monochrome military was the look for Caroline at Burberry.</p>
- Misty Miller at Burberry<p> Dip dyed blue tips see Misty Miller matching her tshirt with her hair.</p>
- Andy Murray and Kim Sears at Burberry<p> Cute couple alert!</p>
- Sam Cam<p> The prime minister's wife takes in the Peter Pilotto collection in head-to-toe black.</p>
- Pamela Anderson<p> Pamela Anderson? On the front row? Yep, the former Baywatch star added a dose of sex appeal to the Vivienne Westwood Red Label 2012 show.</p>
- Paloma Faith, Pamela Anderson, Hilary Alexander and Tracey Emin<p> The Vivienne Westwood Red Label 2012 show pulled in the likes of Pamela Anderson and Tracey Emin.</p>
- Beyonce and her mum, Tina Knowles<p> Beyoncé strutted her stuff - and her bump - in a glittering sequin-covered jumpsuit as she took to the catwalk with her mum Tina after the House of Dereon show at Selfridges.</p>
- Peaches Geldof, Poppy Delevigne, Paloma Faith, Diana Vickers, and Dionne Bromfield<p> Could this be the most brightly-coloured front row yet? Paloma Faith and Dionne Bromfield in particular stood out at the Sass and Bide show.</p>
- Erin O'Connor<p> Model Erin O'Connor gets stripey at <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/" target="_blank">PPQ</a>.</p>
- Diana Vickers (left) and Dionne Bromfield<p> The singers kept the front row at colourful at <a href="http://www.mydaily.co.uk/2011/09/16/catwalk-review-sass-and-bide-spring-summer-2012/" target="_blank">Sass & Bide</a>.</p>
- Peaches Geldof<p> The presenter and socialite kicked off her fashion week in black at <a href="http://www.mydaily.co.uk/2011/09/16/catwalk-review-felder-felder-spring-summer-2012/">Felder Felder</a>.</p>
- Hofit Golan<p> Socialite Hofit Golan was the quintessential woman in red at <a href="http://www.mydaily.co.uk/2011/09/16/catwalk-review-paul-costelloe-spring-summer-2012/" target="_blank">Paul Costelleo</a>.</p>
- Richard E Grant<p> We let the boys into the shows too. The actor joined his daughter Olivia for <a href="http://www.mydaily.co.uk/2011/02/20/catwalk-review-jasper-conran-a-w-2011-12/" target="_blank">Jasper Conran</a>.</p>
- Pandemonia<p> The enigmatic front row regular was the curse of all those behind her at <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/" target="_blank">PPQ</a>.</p>
- Jasmine Guiness<p> The model, designer and heiress plays it safe in a cute suit at <a href="http://www.mydaily.co.uk/tag/jasper+conran/" target="_blank">Jasper Conran</a>. Could it be Chanel?</p>
- Naomi Campbell<p> The supermodel made a surprise appearance in a <a href="http://www.mydaily.co.uk/2011/09/16/naomi-campbells-tux-jumpsuit-and-ringlet-curls-toni-and-guy-hair-fashion-show/" target="_blank">tux jumpsuit </a>at Toni & Guy.</p>
- Laura Whitmore<p> The MTV presenter worked an electric blue leather jacket for <a href="http://www.mydaily.co.uk/tag/Toni++Guy/" target="_blank">Toni & Guy</a>.</p>
- Olivia Palermo<p> New York's fashion IT girl rocked the colour blocking trend at Toni & Guy.</p>
- Nicola Roberts<p> The singer showed off her lighter locks at <a href="http://www.mydaily.co.uk/2011/09/16/catwalk-review-bora-aksu-spring-summer-2012/" target="_blank">Bora Aksu</a>.</p>
- Olivia Inge<p> The free-spirited model kept things casual in coloured denim, high-tops and a smile at <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/" target="_blank">PPQ</a>.</p>
- Paloma Faith<p> The singer looked blooming marvelous at <a href="http://www.mydaily.co.uk/2011/09/16/catwalk-review-sass-and-bide-spring-summer-2012/" target="_blank">Sass & Bide</a>.</p>
- Peaches Geldof<p> Peaches added a splash of colour to her ensemble for <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/" target="_blank">PPQ</a>.</p>
- Laura Whitmore<p> For the <a href="http://www.mydaily.co.uk/2010/09/17/catwalk-review-maria-grachvogel/" target="_blank">Maria Grachvogel</a> show, Laura opted for a mish-mash of lace and leopard print.</p>
- Jade Ewan<p> The singer opted for head-to-toe black at <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/">PPQ</a>.</p>
- Zara Martin<p> We're not sure if the stylist is trying to be Catwoman or Batgirl at <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/" target="_blank">PPQ</a>. Either way, it works for us.</p>
- Lydia Bright<p> The reality TV star attempts to raise her fashion credentials in a tri-colour shirt at <a href="http://www.mydaily.co.uk/2011/09/17/ppq-spring-summer-2012/" target="_blank">PPQ</a>.</p>
- Paloma Faith<p> The singer got all patriotic for Ashish. </p>
- Kate Moss and Kristen Stewart<p> Kate Moss is always a joy to see at Fashion Week, but Kate joined by Kristen Stewart is an unusual, but welcome, sight. The pair enjoyed the Mulberry show together, and both looked stylish with Miss Moss choosing double denim, and Kristen looking pretty in a printed mini.</p>
- Sam Cam<p> The first lady goes f-row at the Erdem show (ooh - that rhymes!)</p>
- Kelly Brook and Jessie J<p> Kelly Brook and Jessie J watch the Giles Spring/Summer 2012 show.</p>
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