Louisa Johnson on "The X Factor" UK 2015
Louisa Johnson on "The X Factor" UK 2015Screenshot from "X Factor" UK YouTube Video

"The X Factor" UK 2015 grand finale will kick off tonight and finalists Reggie N Bollie, Che Chesterman and Louisa Johnson will perform live one last time this season for public votes. One of them will be crowned winner on Sunday.

Tonight, the finalists will take on two songs each, one their favourite song of the series and another one a duet with celebrity guest. Top two acts will perform their winner's singles during the results episode on Sunday.

[READ: Who is the winner of "X Factor UK 2015" - Louisa Johnson or Reggie N Bollie? Results live streaming details

Song choices:

Reggie N Bollie: "Spice Up Your Life" by Spice Girls and "Boom Boom Boom" by Outhere Brothers, and "Jump" by Kriss Kross.

Che Chesterman: "In The Air Tonight" by Phil Collins and "Valerie" by Mark Ronson Ft. Amy Winehouse.

Louisa Johnson: "Fighter" by Christina Aguilera and "I Believe I Can Fly" by R Kelly.

The finalists will give their best tonight as it will determine their fate in the competition. Louisa, who has been having a good run so far in the competition, is said to be unwell again. A sore throat affected her performance in the quarter-final before she bounced back in the semi-final.

"So sorry that I'm missing tonight in liverpool! Need to be on strict voice rest ahead of the biggest week of my life, it needs to be perfect, (sic)" tweeted Louisa on Wednesday.

"The X Factor" UK grand finale will be telecast live at 8 pm on Saturday, 12 November. The episode will be aired on ITV1 and ITV1 HD, and live streaming will be available on the channel's website.

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