The Someone Like you hitmaker has been booked as a guest on the final of the singing competition on December 11, marking her first performance since she was diagnosed with a vocal cord haemorrhage back in October.
The star was hand-picked by show boss Simon Cowell in February after her breathtaking Brits performance.
The 23-year-old will perform a duet with one of the final three, while Michael Buble and Coldplay have also been booked to perform with the programme's hopefuls.
A source told British newspaper The Sun: 'Her management said this week she is still planning to make it. It's amazing news for fans and viewers.'
Adele, who cancelled concerts in both Britain and the US this year due to her throat problems, underwent surgery earlier this month to correct the issue.