The 'Flying Without Wings' boyband, who announced their plans to split last week, have signed up for a one-off special for ITV1.
Westlife: For The Last Time will see Nicky Byrne, Kian Egan, Mark Feehily and Shane Filan sing their greatest hits in front of a studio audience, as well as partake in behind-the-scenes interviews.
Commissioned by ITV's controller of entertainment John Kaye Cooper, the programme is likely to air on a Saturday or Sunday night after The X Factor, and could be shown after the final.
Since forming in 1998, the group have had 14 number one singles in the UK.
Digital Spy's Westlife split coverage:
> Video: Five career songs
> Gallery: Westlife's career in pictures
> Poll: What was their best song?
Watch the video for 2001 track 'When You're Looking Like That' below: