The Saturdays strip off for Sport Relief The Saturdays, from left, Frankie Sandford, 23, Mollie King, 24, Vanessa White, 22, and Rochelle ...

The Saturdays strip off for Sport Relief

The Saturdays, from left, Frankie Sandford, 23, Mollie King, 24, Vanessa White, 22, and Rochelle Wiseman, 22, strip off for Sport relief

Doing their part: Organisers are hoping members of the public will buy the special footwear to take part in the sporting challenge from March 23 to 25

Posing in just socks and their underwear, The Saturdays have sex appeal.

And it's all for a good cause.

The girl band stripped off ahead this month's Sport Relief Mile challenge.

In one shot, Frankie Sandford, 23, Mollie King, 24, Vanessa White, 22, and Rochelle Wiseman, 22, an be seen standing behind red doors wearing the official £2.50 red and white Sport Relief socks.

Organisers are hoping members of the public will buy the special footwear to take part in the sporting challenge from March 23 to 25.

Frankie said of the attire: 'Me and the other girls aren't usually a fan of wearing socks but we can't get enough of the official Sport Relief Socks from Sainsbury's.

'They're perfect to wear for anything - from lounging round the house to training for the Sport Relief Mile.'

Maybe Rochelle is reminding her fiancé Marvin Humes, of boyband JLS, why he's marrying her.

It was revealed today that the band are planning an epic James Bond-style stag do for newly-engaged singer, 26.

JB told the Daily Star: 'He doesn’t know anything. It remains hush-hush.'

Aston added: 'The best part about it is that when he leaves the house he’ll have no idea where he’s going. He’ll have his passport and that’s it.

'There’ll be no airline ticket or anything and we’ve given the pilot strict instructions to not announce where the plane is going.

'He could be going to the sun or up a mountain. He won’t know. The organiser used to work for MI5.'

Marvin, who proposed to Rochelle on holiday in Antgua over Christmas, added: “I have no idea. They won’t tell me whether to pack shorts or a coat.”