A1, 5ive, 3T, Damage, 911, Blue and 5th Story are all heading off on tour together tomorrow (17 October) and will travel the length and breadth of the country for 13 days.
This week, the 90s and 00s bands have been busy rehearsing at a secret location in London and plan to start by wooing the ladies in Sheffield on Friday.
During a break, the entire clan got together for a group photograph, which Blue's Duncan James shared with his fans on Twitter.
Commenting on the snap, he simply told his followers: "And so it begins....Tour life!! #BigReunionBoyBandTour."
We know they're all grown up now, but you've still got to feel sorry for the tour bus driver!
Ahead of their mega road trip, some of the lads have taken time out to chat to Reveal about their expectations and finding fame again.
Following Abz Love's shock departure from 5ive, the boy band were quick to assure fans that they are "not quitters". Meanwhile, Ritchie Neville has been busy gushing about becoming a dad for the first time!
The 3T lads are particuarly looking forward to going on tour with all of the other bands. In fact, they've even described it as a high school reunion!
We're sure there will be plenty of cheeky antics along the way, and no doubt lots of surprises in store for 5th Story's Adam Rickitt. Given his forthcoming wedding to Good Morning Britain's Katie Fawcett, Adam and the boys are treating the tour as one big stag do.... Uh oh!
Are you going to the tour? Tell us below, as the best comment from across the website each week wins £50.