Posh gets back to the day job for first Spice Girls performance

Dressed as sexy wartime sirens, the girls vamped it up in clingy satin frocks and stilettos for their debut reunion performance was the first time the Spices have performed together since their break-up ten years ago.

And they certainly gave the audience a night to remember with two glamorous costume changes as they performed new song 'Headlines' and Spice Girls favourite 'Stop', courtesy of Posh's designer pal Roberto Cavalli.

Nearly a decade after the five-member group became four — when Geri Halliwell left Mel C, Mel B, Emma Bunton and Victoria Beckham — the Spice Girls reunited for a greatest hits album, released this week, and a world reunion tour, starting in Vancouver on Dec. 2.

Mel C admitted the girls were "nervous".

She said: "It's quite surreal, but everything has come flooding back, all of the songs, and being with each other and rehearsing together, it just feels very comfortable.

"We have got nothing to prove. We just want to come back and live out the good old days."

Mel dismissed rumours of diva-like antics and in-fighting as a "load of c***."

She said: "We've never been divas.

"Our reputation in the business is that we all work very hard and we know that we wouldn't be here if it wasn't for everybody who was involved in our project."

Earlier this week LA-based Posh posted a new message on the girl group's official blog giving fans an update on the reunion tour preparations - and a glimpse of how husband David and the boys are coping with her hectic schedule.

Posh wrote: "I'm currently sat in our rehearsal studio and I am about to have another fitting with the Cavalli team for our costumes.

"The other girls will kill me if I give anything away and I don't want to ruin any surprises... but they look amazing! Roberto and his team have done us proud.

"Rehearsals are going really well, I can't believe that there are only a few weeks until the first show in Vancouver.

"It's really scary but exciting at the same time. "David and the boys have been laughing at me because I've been wandering around the house listening to my iPod and practising the routines.

"We are including some parts of the old routines but bringing them up to date a bit.

"All of the kids have been down to rehearsals. We have an area where they all hang out... its a Spice creche!

My boys are so excited about the tour, they can't wait and I'm really looking forward to them seeing me up on stage. I just hope I don't get over emotional when I see them!"

Posh went on to plug her cameo appearance on hit US TV show Ugly Betty which airs in the UK later this month.

She said: "Ugly Betty was shown over here in the US on Friday, I had such a laugh filming it. If you're in the UK then you will be able to see the episode on Channel 4 at 9pm on Friday 23 November.

"This week is a really busy one for us because not only are we rehearsing for the tour but we are going to be performing at the Victoria's Secret Fashion Show on Thursday.

"Friday is BBC Children In Need day in the UK and we will performing from LA. We will be doing two songs, our new single Headlines (Friendship Never Ends) and also Stop - which is going to look fantastic.

"I can't give too much away but it's definitely going to be worth watching."

And in other news, Scary Spice was voted into the final four of the US version of Strictly Come Dancing, and is one of the hot favourites to lift the Mirror Ball trophy.

She is joined in the last four by singer Marie Osmond, actress Jennie Garth and Indianapolis 500 champion Helio Castroneves.

Mel, 33, showed she hadn't lost any of her scary ways when asked what she would do if she didn't get through.

She jokingly said: "I'm going to beat them all up!"

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