The Saturdays' Frankie Sandford flashes a bit too much leg as she struggles with her tulip hem dress

By Sarah Bull

Last updated at 1:36 PM on 4th July 2011

As one of the UK's leading girlbands, The Saturdays are always under pressure to maintain their style by wearing the latest outfits and keeping up with the fashion trends.

But Frankie Sandford came slightly unstuck with one of the most popular trends of the moment when she stepped out wearing a purple dress with a tulip-style hem.

The 22-year-old singer appeared self-conscious about the plunging dress as she walked her dogs as the group took a break from filming their latest advert.

Pretty in purple: Frankie Sandford stepped out wearing a purple tulip-hem dress as she filmed a new advert with the rest of The Saturdays in London last week

Careful! But Frankie appeared self-conscious about the outfit as she accidentally flashed a bit too much leg

And, as Frankie walked along, a gust of wind caused the dress to blow up even more, causing the singer to show off a lot more leg than she would have liked.

Frankie was then spotted trying to hold down the hem of the dress as she made her way back to the set.

She was joined by her fellow Saturdays bandmates Mollie King, Vanessa White, Una Healy and Rochelle Wiseman as the group shot a new advert in London last week.

Colourful: Mollie King, Rochelle Wiseman and Una Healy looked trendy in their outfits on the set, but haven't revealed what the advert is for

However, the girls are being very cagey about what the advert could possibly be for.

Una wrote on her Twitter page to tease fans: 'Hanging in our winnebago for lunch! Been shooting for 3 long days at different locations, can't say for what yet but its really cool!'

It could be that the advert is for a clothing company, as all the girls looked very dressed up as they arrived on set.

While Mollie also showed off her slender legs in a pretty floral dress and heels, Rochelle looked more casual in a rust-coloured maxi dress, while Una opted for skinny jeans and a leopard-print T-shirt with black boots.

Belting it out: It was a busy weekend for the girls as they took to the stage to perform at the Chester Rocks music event

Toned: Frankie showed off her lean figure in a tiny pair of gold hotpants and midriff-baring top

It was a busy weekend for the girls as they took to the stage as for the Chester Rocks music festival at Chester Racecourse.

And the girls were dressed to kill in their trademark colourful ensembles and heels.

Frankie led the way in a pair of gold denim micro shorts, a midriff leather jacket and matching heels to join her girl band on stage.

Brights: Frankie, Mollie and Vanessa showed off their stage outfits before they performed for their fans

Mollie, 24, wore a bright orange asymmetrical dress alongside black laced ankle boots, while Vanessa, 21, joined in on the orange theme with her top but donned blue shorts.

Rochelle, 22, also threw on a flowing mandarin-coloured skirt with the same boots that Mollie wore but accompanied them with a black top.

Cheeky! Mollie donned hotpants baring the American flag as she left Chester Racecourse after performing

Read more: http://www.dailymail.co.uk/tvshowbiz/article-2011071/The-Saturdays-Frankie-Sandford-flashes-bit-leg-struggles-tulip-hem-dress.html#ixzz1RAfPHUcF