Naughty but nice! The Saturdays dress up in sultry Santa outfits for their first arena tour

By J J Anisiobi

Last updated at 4:58 PM on 2nd December 2011

They seem All Fired Up for their impending tour and judging from rehearsals they will be raising temperatures too.

The Saturdays got one final practice in before packing their bags for the groups first ever arena tour.

Taking inspiration from Father Christmas and his big red suit, the girls have a segment of the show where they dress up in some very sultry outfits.

Merry Christmas: The Saturdays rehearse for their arena tour in some festive costumes

Appearing on stage in red sequined jackets they give a whole new meaning to the phrase 'naughty and nice.'

The girls have been performing dress rehearsals for their first ever arena tour and have been feeling nervous about the experience.

Rochelle Wiseman said: 'The thought that we are about to take on arenas sends a shiver down my spine.

All wrapped up: Mollie King and Frankie Sandford add some sugar and spice to the concert

'It's everything we've ever dreamed of as a band,' she added.

The Saturdays, who have had nine Top 10 singles, have been practising singing new songs on their tour from their as yet unnamed fourth studio album.

Fans can expect a lot of bright colours and brightly coloured costumes as the group whip off their Christmas clothes and change into skimpy outfits.

Together again: Una Healy sings solo while Mollie and Frankie get closer to each other

Under the spotlight: Rochelle Wiseman and Frankie go through the motions

All that glitters: Short silver dresses were worked into the routine with Una's being a looser fitting than the rest

Mollie King can be seen dancing around wearing a pair of very short blue denim pants with a torn white vest and fishnet stockings.

The blonde singer then changes again into a sparkly silver and black mini dress.

In one routine Frankie Sandford, who has recently returned to the band after suffering from illness, flashes her red bra through a pink halter neck top which she teemed with a pair of black high-waisted shorts.

Ready to work: The Saturdays arrive on stage in a large elevator

We salute you: The girl group strike a pose in their sultry office worker costumes

The ladies also dress up as sexy secretaries and make a grand entrance via a large silver lift.

Kitted out in glasses, high heels, pencil skirts and bright bras they arrive on stage and strike a pose before starting to sing.

Una Healy tweeted about her excitement today and said: 'First night of our #AllFiredUpTour tonight in Bournemouth!! Sooo excited! The butterflies have set in! Get Ready, Get Set! Who's coming?Xxx.'

Less is clearly more: Mollie and Frankie show off some revealing outfits in the run-through

Colourful girls: The ladies have brought plenty of variation for their first ever arena tour

Corset girls: The ladies have brought plenty of variation and colour for their first ever arena tour

Rochelle, meanwhile, was feeling exhausted from all the preparation and said on Twitter: 'Just got back to my hotel room after a long day rehearsing on our arena stage eekkk! Its all coming together nicely! I am soooo excited :) x.'

Their 13 date tour will take the girls to Scotland, Northern Ireland and Wales as well as England and pregnant Una will be taking a special something with her for the ride.

She said: 'Having my pillow from home with me on tour is the closest thing to bringing my own bed on tour!'