It's been an emotionally and physically demanding time for our Big Reunion bands. But will it all be worth it, as they get set for their Hammersmith gig in front of thousands of expectant fans?
Tune in tonight at 9pm to find out.
If you can't wait that long, take a peak at some of the amazing performances in store...
As our bands hit rehearsals, it looks like some of our pop stars are a little out of practice when it comes to performing, while others look like they never left the limelight.
Which Big Reunion band do you think will breeze through rehearsals?