Former Pussycat Doll Nicole has no acts of her own left in the competition so she'll be lending her support to Sharon Osbourne's act Sam during this weekend's finale.
Nicole and Sam will perform 'And I'm Telling You' together and, on the eve of the final, the pair were snapped rehearsing their duet at the mammoth Wembley Arena today (13 December).
Judging by those heavy coats it was pretty chilly inside!
Prison officer Sam has made no secret of her excitement to be performing with Nicole, telling ITV's Daybreak earlier today that Nicole has an "amazing voice and amazing range."
Meanwhile, Nicole has been equally supportive of Sam, telling Metro this week: "I've always said it from day one. The first time I saw her sing I thought she is the winner of The X Factor."
In addition to singing with Nicole, Sam will also perform 'The Power Of Love' by Jennifer Rush and Lady Gaga's 'The Edge Of Glory'.
She'll be up against Louis Walsh's two acts, Luke Friend and Nicholas McDonald.
Luke is scheduled to perform alongside Ellie Goulding, while Nicholas will team with Westlife's Shane Filan - who was at Louis' judges' houses and campaigned for him to make the final.
Watch Sam performing 'Listen' by Beyonce in her first audition: