There was a hint that this might happen after Spice Girls made a little stab at it with the Olympics and their musical - but now All Saints and TLC reuniting have made it official.
So grab your crop tops and camo trousers - and start practicing the spoken intro to Never Ever.
1. All Saints
The Appleton sisters et al are back and supporting Backstreet Boys on their 2014 tour. Two doses of 90s nostalgia for one.
The iconic band performed on the American Music Awards with Lil Mama replacing Lisa "Left Eye" Lopes (who passed away in 2002).
Lil Mama played third member of the band in the recent VH1 biopic of the band - but did so with mixed reviews. Well, it was always going to be a tough gig. Nevertheless to see TLC singing Waterfalls after 20 years - two thumbs up from us.
3. MKS (Sugarbabes)
Mutya Keisha Siobhan is the new name for the reformed Sugarbabes. Technically they had their biggest hits after 2000, but we laugh in the face of your rules.
Atomic Kitten made a comeback on the The Big Reunion and the follow-up tour.
They will now be releasing a Christmas single with other 90s groups Blue, Five, Liberty X, 911, Honeyz and B*Witched. Oh we wish it could be Christmas every day.
Beyoncé made all our dreams come true when she reunited Destiny's Child on stage at the Superbowl this year. More of this please:
EXCLUSIVE! WATCH THE BACKSTREET BOYS TWERK
10 THINGS YOU DIDN'T KNOW ABOUT MY LITTLE PONY
MORE CELEB NEWS STORIES