Here's everything we know about the group who have survived the Judges' Houses and are now part of Robbie Williams' acts to perform at the live shows…
Who are A-Star?
A-Star are made up of teenagers Acacia, 15, and Aaliyah, 14, from Leyland, Manchester.
The two auditioned as solo artists but after both were told their choice of songs didn't fit, they were paired together as a duo by Simon Cowell.
They became Robbie Williams' Golden X choice at the Six Chair Challenge after their rendition of Bang Bang by Jessie J, Ariana Grande & Nicki Minaj.
A-Star were taken through to the Live Shows after impressing Robbie their mash-up of Soul ll Soul’s Back to Life and Stormzy’s Big For Your Boots.
Who are this year's X Factor judges?
The judging panel for the fifteenth series of the show has seen a major overhaul.
Simon Cowell remains but all three other judges have been replaced.
That means that Nicole Scherzinger, Louis Walsh, and Sharon Osbourne are no longer on the panel.
Instead, they have been replaced by Louis Tomlinson, Robbie Williams and his wife Ayda Field. Sharon Osbourne will also help out during the live shows.
When is The X Factor 2018 on?
New episodes of The X Factor air every Saturday and Sunday on ITV.
It usually starts around 8pm although the time can vary from week to week.
Last year's contest was won by Rak-Su who triumphed in the final over Grace Davies.
Following the first auditions, the Six Chair Challenge and the Judges' Houses, the live shows started on Saturday, October 20.
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