Just two days before the Spice Girls are set to start their reunion tour in Vancouver, tensions are said to be running high in the girl group.

The girl group have been rehearsing together in Los Angeles for the last month and an inside source told the Daily Mail that it’s been hard going: “It’s obvious from what is going on in rehearsals in Los Angeles that there are a lot of problems.”

“They have been doing their dancing and singing routines [but] are having to change things all the time because the girls are frankly not up to it.”

“There are worries about the stamina - apart from Mel B who [after Dancing with the Stars] is phenomenal and seems to never get winded. Victoria, however, is causing a lot of worry because she just is so thin and does not seem to have the energy. She has to stop for water a lot.”

“People are concerned about her. She is not very fit and doesn’t have much energy. Some people wonder if she is going to last the tour.”

“What they have done is rely on choreography to hide their lack of fitness, so they are doing lots of waving arms and have some amazing backing dancers, but they don’t actually run around much themselves. The on-stage energy is coming from other people.”

“The vocals have been changing a lot during rehearsals and it looks as if the tweaking will continue even into the tour. As far as the music goes it is a very unequal relationship which is why it’s proving so complicated to sort out.”

“Mel C is by far the most vocally talented and has got better since leaving the Spice Girls. She is getting very frustrated as she is finding that she has to go over and over stuff and is constantly waiting for everyone else. She is singing the melody mostly with Mel B.”

“Emma is doing well and trying hard but Victoria has a very airy soprano voice which does not fit in. She has one solo at the moment, but will be well covered by the backing singers. Mostly she and Emma are just doing close harmonies.”

The source added that it’s not just professional issues causing problems and there is a lot of in-fighting between the women: “Mel C and Geri are very, very different people and the biggest rows have been between them. Mel C is completely annoyed by what she calls ‘the babies everywhere’, which as you can imagine does not go down well with Geri.”

“Geri, whose daughter is now 19 months old, spends all her time babbling on about how wonderful Bluebell is and what a wonderful mother she is, and it gets on everyone’s nerves. It’s like she’s the only person to be a mother in the history of the world. And it’s all ridiculous new age stuff.”

“Mel says it’s not because she doesn’t have one of her own, she just thinks that the tour is the wrong place for children, and she thinks that having the creche where they are rehearsing has been a bad idea.”

“The other thing about Geri of course is that she never shuts up. She has an opinion about everything which she always wants to share. It’s causing open arguments; as you can imagine, Mel C is not in the mood to take her opinions about the creative side, given that she’s the only one who has had a decent career.”

Emma is also said to have got annoyed at Geri’s constant mothering advice and told her to “shut up and spend more time with your own kid rather than interfering with mine”.

The costumes - designed by Roberto Cavalli - have also caused annoyance in some quarters: “Emma is not happy with her outfits, because they are a bit revealing and so she’s out of her comfort zone.”

“She wanted Alice Temperley, something beaded and pretty, but was told no. She is wearing control pants under all her outfits and has asked for corsets where she can have them. She is really insecure about her hips which are bigger than they used to be. It has left her feeling self-conscious.”

Geri on the other hand “is happy to bare her flesh, she is working out all the time and is proud of her six-pack.”

“She has suggested coming out in a swimsuit, she wanted to go on stage and show off her body. I think everyone else felt sick at the thought, because it was such a competitive thing to say. No one else wants to get almost naked.”

While fashionista Victoria is not bothered so much the outfits but by her appearance in general: “Victoria has the biggest insecurities.”

“She is worried about her skin, which is very bad again, and her hair, which is falling out. She is thinking of having some short extensions put in to add volume, as the condition is so bad after all of the dyeing this year.

But bad skin and looking a bit tubby might be the least of their worries: Geri’s daughter Bluebell has caught chicken pox from Cruz Beckham and they’re worried it’ll spread throughout the whole tour group and crew.

Geri told GMTV this morning that she is going to leave Bluebell at home until the 18 month old recovers from the illness - but Bluebell was in her most infectious stage, when she was hanging around the Spice rehearsal space before her spots appeared.

A source told the Sun that if any of the women are next in line for the illness, they could develop shingles which would “wipe them out for weeks”, possibly risking the majority of the shows over the next two months.