Adele Adkins
Adele, Coldplay and One Direction are lined up for this weekend's X-Factor final with previous winners Ben Haenow, Leona Lewis, Fleur East and Little Mix as Simon Cowell battles against a ratings slideGetty

X Factor supremo Simon Cowell is set to pull out all the stops for the X Factor final tonight with multi-platinum artists Adele and Coldplay on board and Rod Stewart and Rita Ora reportedly on duet duties as he battles to rescue the ailing format that has plummeted to an average of 6.7m viewers for this series down 50% on five years ago.

Adele will be singing her number one single Hello, while Coldplay will perform recent hit Adventure of a Lifetime. Although the duets for this year's finals have not been officially revealed, reports suggest that Nick Grimshaw's last remaining hope Che Chesterman could be paired with veteran rock singer Rod Stewart, while favourite Louisa Johnson looks almost certain to perform with her mentor Rita Ora. It has also been

It has also been suggested that dance duo Reggie N Bollie may perform with 90s garage star Craig David, although some are still holding out for an appearance by Cheryl Fernandez-Versini who, as their mentor, danced with the boys on a previous episode upsetting some of the viewing public who deemed the action inappropriate.

Chesterman is set to sing In the Air Tonight by Phil Collins and the Amy Winehouse version of the Zootons' Valerie, while Johnson will sing Fighter by Christina Aguilera and I Believe I Can Fly by R Kelly. Reggie N Bollie are expected to perform a mash-up of Spice Up Your Life by the Spice Girls and Boom Boom Boom by the Outhere Brothers. They will also sing Jump by 80s pop stars Kris Kross.

Other artists performing over the finals weekend include boy band One Direction in one of their last performances before their year-long hiatus and former X-Factor contestants Leona Lewis, Ben Haenow and Fleur East and 2011 winners Little Mix. Haenow will duet with Lewis while East will be paired up with Little Mix.

Little Mix tweeted: "EXCITED! We're doing a very special performance with the AMAZING @FleurEast on Sat night's @TheXFactor The Girls x"

East responded: "OMG! It's @TheXFactor time again!! You ready girls? @LittleMix?"

Haenow tweeted: "We're baaaaaack! #XFactorFinal @leonalewis

Cowell has insisted that the X Factor is not in danger of being dumped from the Saturday primetime schedules, despite the broadcaster's aggressive bid for competing singing talent show The Voice succeeding, hijacking it from BBC One at the beginning of last month in a three-year deal thought to be worth £50m.