X Factor 2014 spoilers: Sam Bailey, 5th Harmony and Idina Menzel to perform

Latest X Factor guest stars revealed

Sam Bailey

A trio of guest stars will be appearing on The X Factor 2014 this weekend.

It's the live semi-final on Saturday and Sunday night as the remaining four acts sing for a spot in the final at Wembley Arena.

In Sunday's latest live show, the tension in the studio will be palpable as host Dermot O'Leary tells the remaining acts which of them is safe and which ones have scored the lowest number of votes.

There will be a nail-biting sing-off before another The X Factor dream comes to an end just a week before the end.

Throughout the live shows an outstanding line-up of guest stars will perform, and this weekend is no exception as last year’s The X Factor winner Sam Bailey returns to the main stage to perform.

There’s also a live performance from the AMAZING musical theatre star - and the voice of Elsa from Frozen - Idina Menzel.

It was previously revealed that former X Factor USA stars Fifth Harmony will be making their UK debut on the X Factor too.

The five piece were formed on The X Factor USA back in 2012 by Simon Cowell and they’re going to get all the help they can get with a coveted performance slot on Sunday's show.

Which of the final four acts are your favourite? Vote in our new poll here!

The X Factor airs on ITV at 8PM on Saturday and Sunday nights with the live semi-final.

Browse pictures of Sunday night's X Factor 2014 results here...

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