X Factor: All change for Louis' Groups at Judges' Houses

Over the weekend, the acts going through to Judges' Houses were revealed and the Judges were told which category they'll be mentoring in a phone call from Simon Cowell.

Gary Barlow is looking after the Over 28s, Nicole Scherzinger the Boys, Tulisa the Girls and Louis Walsh the Groups.

Since Bootcamp was filmed in Liverpool, group of three, Rough Copy have left the competition and Louis Walsh has added two groups to the category - so he takes seven acts to Judges' Houses while the other Judges have six!

Louis Walsh says: "When Rough Copy left, I found it difficult to choose between two groups to fill their place. In the end I invited boyband Triple J to come to Judges' Houses, but still felt that as I'd lost such a strong group in Rough Copy that I wanted to make sure the category was the best it could possibly be.

"I asked Gary, Nicole and Tulisa if they minded if I took a seventh act. They were happy as they felt they’d got the right six acts for their Judges Houses trips so I asked Times Red to come along and they said yes".

Louis also felt that Triple J would benefit by having a fourth member and he asked George Shelley (who left the competition at Bootcamp) if he'd like to join JJ, Josh and Jaymi in the band.

On George joining the group, Louis adds: "George loved the idea and as the boys knew him from Bootcamp they were really happy for him to join them. The group then came up with a new name and they are now called Union J".

Union J say: "We couldn't believe it when we got the call about going to Judges' Houses and of course we jumped at the chance. It's a once in a lifetime opportunity. We're so happy to be a four piece too. The group feels so right together, it feels like we've been together for years"!

Times Red say: "We are beyond excited about having a second chance. We have nothing to lose so we’re going all out to impress in Vegas".

On this weekend's The X Factor on ITV1, Gary will be Lord of the Manor at a stately home in the rolling English countryside to meet the Overs; Nicole is at a luxury resort in Dubai with the Boys; Tulisa is on the Caribbean island of St Lucia to greet the Girls; while Louis is in the city that dubs itself the 'entertainment capital of the world' - Las Vegas with the Groups.

The mentors each have a very special guest to help them make their decisions - Cheryl Cole joins Gary, American RnB artist Ne-yo is with Nicole; Brit award winner Tinie Tempah is in St Lucia with Tulisa; and Sharon Osbourne joins her pal Louis in Vegas.

The contestants sing with a live piano or a guitarist in a bid to secure their place in the Live Shows - and not only do they need to impress their mentor, they have to blow their special guest away too. The Judges will each pick three acts to take through to the Live Shows.

The contestants who are through to Judges' Houses are:

Overs:  Melanie Masson, Carolynne Poole, Christopher Maloney, Kye Sones, Nicola- Marie, Brad Shackleton

Boys: Jake Quickenden, Rylan Clarke, Adam Burridge, Jahmene Douglas, James Arthur, Nathan Fagan- Gayle

Girls: Ella Henderson, Jade Ellis, Jade Collins, Lucy Spraggan, Leanne Robinson, Amy Mottram

Groups: MK1, Union J (Formally Triple J), Mitsotu, Poisonous Twin, GMD3, Duke, Times Red.