Atomic Kitten, Liberty X, 911 and Honeyz will also join the pop acts for the extra shows, following the success of the ITV2 series earlier this year.
The groups will play a new date at the Capital FM arena in Nottingham on December 11, at London's O2 Arena on December 14 for a matinee show, and at Manchester Arena on December 15 for a second matinee show.
Tickets for the three new shows go on sale from 9am on April 26.
It takes the total number of shows for The Big Reunion's 'Christmas Party' tour to seven, while the groups will also play 12 headline dates across the UK next month.
However, Blue will not tour with the Big Reunion groups, but will instead embark on their own headline tour this October.
Watch Digital Spy's recent interview with 5ive below: