The Spice Girls are set to reunite for a TV special next year, in what will be the first time they have all been together professionally since the Olympic closing ceremony in 2012.
Attempts to kick start a comeback were scuppered last year when Mel C and Victoria Beckham refused to be involved.
Then the group teased fans last month, as Geri Horner, Victoria and Emma Bunton united to film cameos for Mel C's new video, Room For Love – but Mel B was absent.
It was rumoured that the rest of the Spice Girls had fallen out with the America’s Got Talent judge because she turned them down for the video.
But it has now emerged that the pop legends have been in intense negotiations for months and are ready to launch their comeback with former manager Simon Fuller, with the release of a one-off documentary and compilation album next year.
A source told The Sun on Sunday newspaper: "The five of them have been locked in secret talks since the summer, and finally they are all on-board for a 2018 reunion.
"As it stands, they will be working together on a series of projects, which will include an album and a TV special celebrating the Spice Girls.”
The source added: ”And getting Victoria to agree has been a coup for everyone involved, given she has always been the person holding back on a reunion.
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"The fact she is on board now is down to how much closer the five of them have become recently."
And, the Wannabe hitmakers grew closer this year after Mel B's bitter split from husband Stephen Belafonte hit the news, and she accused him of being abusive and getting their nanny pregnant.
The source added: "Things between them were quite icy at the start of the year. But gradually the ice thawed, and Mel was the one who drove that. Mel's divorce battle also helped to bring them back together, as did the birth of Geri's son.
"Plans at the moment are still in the early stages, and everything involving the girls tends to be complicated because they are so busy. But the team behind the reunion are delighted to have made it to this point."