X Factor: Robbie Williams and Calvin Harris among the stars at Judges' Houses

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Sharon Osbourne and Robbie Williams will be hoping to repeat their previous X Factor success when they deliberate about the Overs in sunny Los Angeles.

Pop heartthrob Robbie helped Mrs O select Sam Bailey back in 2013 - and she went on to win the show.

He is back this year to help Sharon whittle down her category.

Sharon Osbourne and Robbie Williams (ITV)
Robbie Williams and Sharon Osbourne (ITV)

Louis Walsh will be in Ibiza, getting a helping hand from Fleur East and Alesha Dixon.

Alesha Dixon, Louis Walsh and Fleur East (ITV)
Alesha Dixon, Louis Walsh and Fleur East (ITV)

And it looks like the trio won't let the stress of choosing which groups to put through stop them having a giggle.

Alesha Dixon, Louis Walsh and Fleur East (ITV)
Louis Walsh's team share a joke (ITV)

Nicole Scherzinger has the Boys, and she invited Calvin Harris to join her in Nice, France for Judges' Houses.

They will have a tough job cutting talent from the former Pussycat Doll's team, as she is mentoring a host of strong contenders such as Christian Burrows, Matt Terry and Niall Sexton.

 Nicole Scherzinger and Calvin Harris (ITV)
Nicole Scherzinger and Calvin Harris with the contenders in the Boys category (ITV)

Meanwhile, X Factor boss Simon Cowell has not one but two Spice Girls at his side as he deliberates over the Girls.

Mel B, who has been on the judging panel in the past, and former Baby Spice Emma Bunton are both on hand to help Simon make the right choices.

Mel B, Simon Cowell and Emma Bunton (ITV)
Mel B, Simon Cowell and Emma Bunton (ITV)

The trio flew out to Malibu for this stage of the competition.

Mel B, Simon Cowell and Emma Bunton (ITV)
Mel B, Simon Cowell and Emma Bunton (ITV)