B*Witched, Liberty X, 5ive, 911, Atomic Kitten and The Honeyz reformed as part of an ITV2 series which sees them perform a one-off show at the Hammersmith Apollo on February 26.
Tickets for the event sold out in minutes following the success of the first episode, and producers of the show are now planning to tour the concert around the UK.
"As the Hammersmith Apollo show sold out in 5mins, producers are in talks about a possible UK Arena Tour!" Liberty X star Michelle Heaton revealed on Twitter.
The Big Reunion attracted over a million viewers when it launched last week.
This week's episode will focus on 911 and Atomic Kitten, with Kerry Katona reuniting with her former band for the first time in over ten years.
The Liverpool trio reveal details of their biggest fights on the show, including Katona recalling making Liz McClarnon change in the toilets and stamping on her foot on stage.
Watch Digital Spy interview The Big Reunion stars below: