What a comeback! Leona Lewis looks perfect in purple as she debuts new single live on The X Factor
23:11 GMT, 7 October 2012
01:26 GMT, 8 October 2012
She is one of the show's most successful winners and returned to our screens this year as a guest judge but Leona Lewis cemented her X Factor comeback when she performed her new single live on Sunday night's results show.
The Hackney-born singer, who was crowned The X Factor winner in 2006, looked positively regal as she donned a floor-length purple Ariella Couture gown to perform new singe Trouble.
Blowing this year's contestants out of the water, Leona wowed the crowd with her flawless vocals on the track, which she has admitted is about her former love Lou Al-Chamaa, released earlier this week.
Scroll down for video…
Knockout: Leona Lewis wows as she takes to the X Factor stage in a floor-length, purple gown
With her long mane sleeked back into a high ponytail, the 27-year-old global superstar seemed a far cry from the shy secretary who auditioned in front of Simon Cowell six years ago.
The purple gown, with long, sheer arms and cutaway sides made the young singer look every inch the superstar.
Powerhouse: Leona shows this year's contestants how it's done as she performs on stage
Global superstar: Leona gives a flawless performance before chatting to Dermot O'Leary about this year's competition
After her performance, Leona had the chance to chat to host Dermot O'Leary, revealing that she was backing Jade Ellis.
'I'm supporting Jade. I think she always looks amazing and sounds stunning,' she told the host.
The former winner certainly knows what she's talking about, having won three Grammy Awards since her time on the show.
In awe: All the judges look on as the 2006 winner performs Trouble ahead of the results
Standing ovation: The judges jump to their feet as Leona finishes her powerful rendition of her new single
Earlier in the day the star took to Twitter to express her excitement at being back on the stage where it all started for her:
'Getting ready for my performance on X factor tonight, who's watching '
After her rendition of her future hit, RnB superstar Ne-Yo, who helped Nicole out at Judge's Houses, took to the stage.
Superstar: Ne-Yo takes to the X Factor stage after helping out Nicole at Judges' Houses
After the two performances, things turned a lot more dramatic for this year's contestants and the judges.
Rylan Clarke was controversially saved and Carolynne Poole was sent home after The X Factor sing-off was taken to deadlock, thanks to a last minute decision by Louis Walsh.
After hearing that his act was the first to be booted off the show and that controversial Rylan was going through to next week, Gary Barlow stormed off the stage.
Without waiting to hear what his act Carolynne had to say, the Take That singer got up from his seat and left the arena, after criticising the Essex wannabe on Saturday night for his poor performance.
Dramatic moment: Gary storms off the stage after it''s announced that Rylan is through to next week's show
It's all over: Carolynne is devastated after being the first to be booted off the show
While Nicole Scherzinger and Gary both predictably voted to save their own acts, Tulisa Contostavlos voted for country singer Carolynn to stay in the competition.
But it was down to Louis Walsh to give the final vote and have his say on their fates in the competition.
Louis, whose group acts all went through to next week, took his time in making his decision before tentatively telling Dermot O'Leary that he wanted to save Carolynn.
Fuming: Gary leaves the stage as soon as the decision is revealed, prompting gasps from the audience
Moment of truth: Dermot announces who got the least public votes after the decision is taken to deadlock
When asked to state clearly who it was that he wanted to send home, Louis then dramatically changed his mind and told the host that he wanted to instead take the decision to deadlock, which caused a huge reaction in the audience and the other judges sitting beside him.
'I'm sorry, I'm changing my mind, I want to take it to deadlock,' he told Dermot.
Carolynne, who thought that she had been saved by the judges then faced uncertainty as the results of the viewers votes were read out.
First goodbye: Rylan gives Carolynne a hug as she's says goodbye to the show that she's worked so hard to be part of
Emotional: Rylan leaves the stage after an emotional showdown and harsh criticism form Gary
While the 32-year-old singer, who got through to Judges' House last year, was magnanimous in defeat, but her mentor wasn't as he angrily look at Louis before storming out of the auditorium.
Speaking backstage, Gary called the outcome an 'absolute joke', telling his act that 'two years running you've lost out to joke acts', a sentiment pointing to the fact that she narrowly missed getting to the live rounds last year when she originally applied for the show.
Reaction: Gary speaks to Olly Murs and Caroline Flack on ITV2's The Xtra Factor after the show
What a night: The tension is palpable after the acts perform their sing-off song
Rylan's high-octane performance of Spandau Ballet's Gold split the critics on Saturday, promoting Gary to react strongly:
'I wanted to have some fun and I really was having fun until you started singing tonight. I was embarrassed to be sat here.'
While the other judges were kinder to the wannabe star, they were all agreed that Carolynne's rendition of Nicki Minaj's Starships was a great performance.
Saved: Nicole supports her act after a tension-filled night
Earlier in the evening, all 13 acts took to the stage for their first group performance, singing Emeli Sande's Read All About It.
In recent years the group performance has been mimed, but this year all of the acts had the opportunity to sing live.
Group performance: District 3 take to the stage with the other 12 acts for the first live group performance
Urban: Charlie Rundle and Simoen Dixon of MK1 were criticised for their vocals last night
Having to work together for the first time, all of the contestants got the chance to sing part of the song and showcase their individual talents.
After the performance, the acts left the stage and headed backstage to wait for the last of the votes to come in.
Leona Lewis, who became a global megastar after winning the talent contest in 2006, also took to the stage during the evening to perform her new single, Trouble, before the results were announced.
Boyband: Union J give it their all alongside their fellow contestants
Saved: Jade and Jahmene impressed during their first live performance and were saved through to next week
She stunned in a purple gown as she made a return to the show which made her famous.
And Ne-Yo also performed for the lively crowd following his performance earlier in the day at the BBC Radio 1 Teen Awards.