Jessie J puts on a brave face as she joins Kylie Minogue at the Capital Jingle Bell Ball after admitting her cancer could return

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Jessie J put on a brave face as she returned to the stage on Sunday night after undergoing a mastectomy. 

The singer, 37, had surgery to remove a lump in her right breast in June after being diagnosed with early breast cancer and admitted this week there is a chance her cancer could return. 

The songstress joined a star-studded line-up to perform in front of a 16,000 strong crowd at The O2 for Capital's Jingle Bell Ball with Barclaycard. 

Ahead of her performance, Jessie posed for photos and rocked a brown pinstripe baseball jacket and matching trousers. 

Headline act Kylie Minogue , 57, wowed in a fringed PVC minidress which she teamed with matching boots as well as a striking red dress. 

Louis Tomlinson, Cat Burns and Tinie Tempah also hit the stage.  

Jessie J put on a brave face as she returned to the stage on Sunday night after undergoing a mastectomy

Jessie J put on a brave face as she returned to the stage on Sunday night after undergoing a mastectomy

Headline act Kylie Minogue , 57, wowed in a fringed PVC minidress which she teamed with matching boots

Headline act Kylie Minogue , 57, wowed in a fringed PVC minidress which she teamed with matching boots 

Jessie has returned to the spotlight in recent weeks after having to delay her tour

Jessie has returned to the spotlight in recent weeks after having to delay her tour

Former One Direction star Louis made his solo debut at the event.

He previously performed at the Jingle Bell Ball with his former bandmates in 2011 and 2012.

Louis' new single Lemonade has become a firm favourite on Capital, and bosses are said to be keen to give him his moment to shine.

Jessie has returned to the spotlight in recent weeks after having to delay her tour. 

Discussing her cancer battle this week, the singer told ABC News: 'I've been really lucky, super lucky, to find it so early.

'It wasn't invasive, thank god. I know there's a chance it could come back but until then we're living life.'

Back in October, Jessie spoke of 'frustrated' she was after doctors postponed her second cancer surgery, after she had cancelled her tour to have it. 

The singer said: 'Some of you may know, some of you may not know, I was supposed to have a second breast surgery two weeks ago,' she told fans.

'So a week before my surgery I went to my surgeon and we discussed my surgery and it felt a little more complex than he was anticipating and referred me to a different surgeon who I then saw, had a meeting with who said: "I think this can wait a little while".

Jessie looked thrilled to be back on stage after having to postpone her tour due to her health

Jessie looked thrilled to be back on stage after having to postpone her tour due to her health 

The songstress pulled out all the stops for her performance

The songstress pulled out all the stops for her performance 

Jessie was feeling the love as she took to the stage

Jessie was feeling the love as she took to the stage 

The Price Tag hitmaker interacted with the crowd during her set

The Price Tag hitmaker interacted with the crowd during her set

Kylie got into the festive spirits as she changed into a red dress

Kylie got into the festive spirits as she changed into a red dress 

Kylie wowed the crowd as she stormed the stage

Kylie wowed the crowd as she stormed the stage 

The songstress lit up the stage as she performed a medley of her greatest hits

The songstress lit up the stage as she performed a medley of her greatest hits 

Ahead of her performance, Jessie posed for photos and rocked a brown pinstripe baseball jacket and matching trousers

Ahead of her performance, Jessie posed for photos and rocked a brown pinstripe baseball jacket and matching trousers 

The singer, 37, admitted this week there is a chance her cancer could return

The singer, 37, admitted this week there is a chance her cancer could return

The Price Tag singer, 37, revealed in June that she had been diagnosed with breast cancer and subsequently underwent a mastectomy and reconstructive surgery

The Price Tag singer, 37, revealed in June that she had been diagnosed with breast cancer and subsequently underwent a mastectomy and reconstructive surgery

The songstress joined a star-studded line-up to perform in front of a 16,000 strong crowd at The O2 for Capital's Jingle Bell Ball

The songstress joined a star-studded line-up to perform in front of a 16,000 strong crowd at The O2 for Capital's Jingle Bell Ball

Headline act Kylie, 57, put on a stylish display in a white lace top and black skirt with a thigh-high split before her performance
Kylie appeared in high spirits as she walked the blue carpet ahead of taking to the stage

Headline act Kylie, 57, put on a stylish display in a white lace top and black skirt with a thigh-high split before her performance

The Jingle Bell Ball is an annual December concert event organised by UK radio station Capital FM

The Jingle Bell Ball is an annual December concert event organised by UK radio station Capital FM

Jessie had an interview with Margie Keefe aka Grime Gran backstage

Jessie had an interview with Margie Keefe aka Grime Gran backstage 

Tinie Tempah stripped off his shirt on stage during his performance

Tinie Tempah stripped off his shirt on stage during his performance 

The rapper display his muscular physique

The rapper display his muscular physique

Since its debut in 2008, the ball has become one of the most highly anticipated pop music events in the UK, bringing together chart-topping artists for a two-night celebration

Since its debut in 2008, the ball has become one of the most highly anticipated pop music events in the UK, bringing together chart-topping artists for a two-night celebration

Traitors star Cat Burns gave it her all as she took to the stage

Traitors star Cat Burns gave it her all as she took to the stage 

Cat cut a casual figure as she posed for a photo backstage

Cat cut a casual figure as she posed for a photo backstage 

Former One Direction star Louis Tomlinson made his solo debut at the event

Former One Direction star Louis Tomlinson made his solo debut at the event

Louis previously performed at the Jingle Bell Ball with his former bandmates in 2011 and 2012

Louis previously performed at the Jingle Bell Ball with his former bandmates in 2011 and 2012

Louis' new single Lemonade has become a firm favourite on Capital, and bosses are said to be keen to give him his moment to shine

Louis' new single Lemonade has become a firm favourite on Capital, and bosses are said to be keen to give him his moment to shine

Robyn Richford put on a leggy display in a pale yellow minidress and chiffon scarf

Robyn Richford put on a leggy display in a pale yellow minidress and chiffon scarf

Kem Cetinay looked ready to hype up the 16,000 strong crowd with his DJ set

Kem Cetinay looked ready to hype up the 16,000 strong crowd with his DJ set 

FIVE made a surprise performance and delighted the audience as they played a medley of their biggest hits

FIVE made a surprise performance and delighted the audience as they played a medley of their biggest hits 

'Obviously I'd already cancelled my tour so I was obviously frustrated but again it's out of my control and two different surgeons had two different opinions.' 

Jessie said that following the news immediately went into 'mum mode' and got to organising and revealed there would be new dates for her US tour. 

In September, Jessie returned to the stage on Saturday for her first live performance  following her cancer battle. 

She opened her set at BBC Radio 2 In The Park in Chelmsford, Essex to a loud applause from fans.

Appearing emotional on stage, she told the packed crowd: 'Some of you may know, some of you may not know, but I had breast cancer surgery 11 weeks ago today.

'And the last show I did, I had no idea what was gonna happen, and I'm still very much in the recovery process, but I'm definitely not ready for Babins.

'I mean, I am, but my doctors are like "calm down, girl". Do you know what I mean, you can take the girl out of Essex, put her back in to Essex.

'But I'm just so grateful to be here, you have no idea how grateful I am to see so many of you singing along after all these years.

'It truly feels like I'm a little kid. Still doing what I love.'

The Jingle Bell Ball is an annual December concert event organised by UK radio station Capital FM.

Since its debut in 2008, it has become one of the most highly anticipated pop music events in the UK, bringing together chart-topping artists for a two-night celebration at London's iconic O2 Arena. 

FIVE returned to deliver yet another standout Out Of The Blue performance after wowing the crowd on Saturday night. 

Speaking about the surprise performance, Abz said: 'Getting to go on a 25-date tour this year has been incredible, three of which were at The O2. As a Hackney boy, I love performing in my hometown. The energy tonight was just on another level because people didn’t know we were going to be there.'

Ritchie added: 'Performing as this year’s Barclaycard Out of the Blue surprise guest is so different to performing at our own shows because people weren’t expecting it. The crowd went crazy and that’s exactly the response we were hoping for.'