Big Brother three winner, Kate Lawler, has vowed to run the London Marathon in her underwear if she manages to raise £20,000.

On her MySpace page Kate revealed:

“On Sunday April 13, 2008, I shall be running the London Marathon.

“It is 26 miles [41.8km] and all money I raise shall be donated to my charity Cystic Fibrosis. You can help by donating just £2 ….or £2,000!

“Every penny counts and if I raise £20,000 by April 13 I will run the marathon in my underwear only! Yes that is a promise.”