Posh's sister Louise upset at being left holding the Beckham babies

The 33-year-old has angered her sister Louise over childcare for her children - Brooklyn, Romeo and Cruz - while she rehearses for the band's forthcoming world tour.

Louise, who has two kids of her own, is said to be livid that Victoria is expecting her to jet around the globe with her - purely to babysit the boys.

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A source said: "Louise loves the boys dearly but sometimes she does get angry that Victoria expects so much of her.

"The pair of them are very close but Louise is going through a difficult time at the moment after splitting with her husband, so it's pretty bad timing."

Blonde Louise split with her lover Hayden Isted last month, claiming that the pair simply fell out of love. Singer-turned fashionista Victoria was said to have comforted her during the difficult period - but now it looks like she wants a favour.

Victoria's football ace husband David will be around for some of the time, but despite the Major League Soccer season being finished, he has numerous work engagements that need to be fulfilled.

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Our source adds: "David will be at Victoria's side as much as he possibly can but it is a huge commitment for the whole family.

"There will be a lot of jetting here, there and everywhere during the tour, as, for example, Brooklyn has to go to school and the Beckhams are adamant that his mum's career won't affect his education."

Posh's babysitting woes appear to have spilled over into the group's rehearsals.

The new look 'Spice Women' unveiled their racy new look in the new video for their single Headlines.

But away from the cameras, rehearsals for their tour are in danger of being dominated by babytalk.

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Geri has been keeping fans up to date with a blog on the girls website and it seems as if they are all preoccupied by, as Geri called them, the 'Spice Kids'.

Geri wrote in the blog post: "(Emma Bunton's son) Beau is sitting opposite me on Emma's lap, giving a smile.

"Cruz (Beckham) has been looking for a pump to blow up his rocket and now he's trying on Melanie C's hoodie."

She added: "Bluebell is on her way down here in a bit. She keeps on picking up a microphone, so it's like the Waltons on tour with babies and husbands all around.

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The somewhat chaotic sounding scene is completed by the addition of Emma's partner Jade Jones, who Geri described as "the perfect daddy".

The girls are working hard to prepare for their reunion tour which starts December 2 in Vancouver, Canada.

And Virgin boss Richard Branson recently announced he will save the Spice Girls a fortune by paying the cost of their air travel for the tour.

The British billionaire will cover the expense of all the group's Virgin Atlantic flights himself, because he still feels he owes the five-piece for signing with his Virgin record label 12 years ago.

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Despite having split up nearly a decade ago, since coming back together Geri said: "We're working hard and it's like we've never been apart."

She added: "The Spice Girls are now Spice Women – full, sensual and stronger through their life experiences."

The blog also revealed that Mel C, credited as the most musicially talented Spice, has handpicked the band and is "cracking the whip".

And Posh is, of course, calling in a favours with designer pal Roberto Cavalli, who is designing all their stage outfits.

In a post, Mel C revealed Emma, Victoria, and Geri had a meeting with Roberto Cavalli's team and promised the costumes for the tour are going to be "amazing".

She also said the girls are all very proud of Mel B's success on Dancing With The Stars, and the group are filming behind the scenes for a documentary to accompany the reunion.