The girls have posted the following message to the fans on their official website.
Firstly, thanks to each and every one of you who has bought a copy of our Greatest Hits album, we hope that you are enjoying reliving some Spice memories.
We've had a busy week with the Victoria's Secret Fashion Show and also Children In Need but it was such an amazing feeling to be back on stage together again. Thanks to all of the fans who made it down to the CBS Studios for the Children In Need performance, it was GREAT to have so many of you in the audience.
Rehearsals are going really well and we can't wait for you to see the show, not long to go now!
Emma, Geri, Mel B, Melanie C and Victoria