Posh and the girls accept £10million each for Spice Girls reunion

All the members of the former chart-topping band; Victoria Beckham (Posh Spice), Melanie Brown (Scary Spice), Melanie Chisholm (Sporty), Geri Halliwell (Ginger), and Emma Bunton (Baby) will be present for the announcement of the group's return to the pop arena next week.

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Masterminded by former svengali and ex-Spice Girls manager Simon Fuller, the group are to announce details of their 25-date "farewell" extravaganza at the O2 Dome in Greenwich, south London, next Thursday.

A statement issued from Fuller's 19 Entertainment, said: "No further information can be given at this time but given the bands unique history, you can be sure to expect the unexpected!."

The announcement will put an end to speculation surrounding a comeback by the girls which reached its height when all of the former Spice's bar Mel C were reunited at David Beckham's birthday party in London earlier this year.

A source told The Mirror: "This deal has taken years to sign off. But finally all of the girls are on board.

"It's going to be one of the most phenomenal pop events ever. No expense is being spared to make this an unrivalled spectacular."

According to the Mirror, the band's Virgin record label is so keen to keep the girls happy that they are hiring five private jets to take each of the singers - and their respective entourages - around the globe.

The Mirror revealed last month how the band were being offered £5million each for a six-date tour.

After intense negotiations, following Melanie Chisholm's reluctance to get involved, the £10million deal saw them agree to expand the gigs that begin in London in December.

A source told the Mirror: "The sum on the table is huge - but then it had to be to get the more reluctant members like Mel C to agree.

"She's been quite precious about her solo career and has always said she'd never get back with the girls.

The source added: "Now she's now one of the most enthusiastic - although they're all buzzing with a mixture of excitement and trepidation."

The lives of Posh, Scary and Mel have changed considerable since the girls' 90s heyday. No longer commitment-free, the reunion tour will need to accommodate the girls entourages which include children, nannies and family members. The private jets will no doubt help ease the strain. According to the source: "Geri doesn't want to be apart from daughter Bluebell for the tour - and the only reason Victoria has agreed is so that her sons can see what she used to do. That all needed to be taken into account."

After the London launch, Posh, Geri, Emma, Mel B and Mel C will then travel all over Europe, the Far East, America and the Middle East for the remaining 24 dates through to the end of January.

It will be the first time the band have performed together since May 1998 - when Geri Halliwell quit during a 102-date world tour.

The remaining four Spices bowed out of pop music in February 2001.

Two new tracks for their upcoming Greatest Hits album have also been laid down - though there will be no new singles.