All four categories will come together for the first time tonight
17:17, 25 Nov 2017Updated 20:18, 25 Nov 2017
The theme for the X Factor semi-final is Cool Britannia(Image: )
It's the X Factor semi final and things are getting serious.
Tonight will see all of the remaining six contestants come together for the first time ever as they battle it out for a place in next week's final.
Until now, two categories have faced off against each other on Saturdays, with the other two going head-to-head on Sundays.
The acts with the lowest number of audience votes on both nights have been sent home immediately, with no sing-off and no judges' decision, while the best performing acts from both nights have battled it out for a 'priceless' prize, such as a masterclass with Pink and time in the studio with the world's best songwriters.
READ MORE: X Factor hopeful Lloyd Macey reveals cancer scare after losing 7st in six weeks
Lloyd is in the semi-final(Image: Thames/Syco/REX/Shutterstock)
Grace will be fighting for a place in next week's final(Image: REX/Shutterstock)
But now, it's all set to change.
In tonight's semi-final, all of the acts will sing for their place in the final, and for the first time, they'll each have the chance to sing twice over the weekend.
This week's theme is Cool Britannia, which will see the hopefuls celebrate the best of British music.
So what's everyone singing for judges Simon Cowell, Nicole Scherzinger, Sharon Osbourne and Louis Walsh?
Here are the song choices:
Girls
- Grace Davies - Life On Mars? by David Bowie
Boys
- Lloyd Macey - Don't Let The Sun Go Down On Me by Elton John
Rak-Su will be giving it their best shot(Image: REX/Shutterstock)
The Cutkelvins are in the semi-final(Image: REX/Shutterstock)
Groups
- Rak-Su - Flowers (Sunship Edit) by Sweet Female Attitude
- The Cutkelvins - Nothing Like You by The Cutkelvins
Overs
- Kevin Davy White - Come Together by The Beatles
- Matt Linnen - Gimme Shelter by Rolling Stones
Last week saw Holly Tandy, Rai-Elle Williams, Sam Black and brothers Sean and Conor Price were sent home in two shock double eliminations.
Rai-Elle promised that this would not be the last that fans had seen of her.
While Holly, who was left in tears, thanked the judges and the public for their support.
It was a tough night for Sharon, who lost two of her three remaining acts.
READ MORE: "Troublemaker" Olly Murs mercilessly TROLLED for his reaction to Oxford Circus 'gun shots' - and even Piers Morgan tells him off
Kevin is in the running(Image: ITV Picture Desk)
Matt is fighting for a place too(Image: REX/Shutterstock)
There was a lot of disappointment in the studio after the eliminations, and even Simon himself questioned the decision to kick two acts out of the competition.
Speaking after the result was revealed, Sean said: "We’ve had a great time, we never expect to come so far in the competition. Every weekend, every minute is a highlight for me."
A gutted Sam said: "I just want to say thank you to everyone who’s voted for me, thank you Simon, Louis is the best judge, I’ve had a great time."
Mocking himself, Simon joked: "Whose idea was it to do a double elimination?"
* X Factor continues tonight at 7.30pm on ITV