What's a Moonwalk? Well, it involves lots of women walking either a marathon or a half-marathon in the middle of the night, wearing just bra and leggings, to raise lots of cash to fight breast cancer.
Stripping off to my bra in front of thousands of people and walking around central London for several hours sounds more like a bad dream than a typical fundraising challenge, but I suppose that's the point.
I won't be on my own though - there's a cross-party group of women MPs attempting the 13 mile "Half Moon" challenge together on Saturday 17th May, starting and finishing in Hyde Park.
We've all been sent a bra and a special booklet full of ideas for how to decorate it, so my creative skills will also be tested!
Please do sponsor me for this unusual challenge - and an excellent cause.
Donating through this site is simple, fast and totally secure. It is also the most efficient way to sponsor me: Walk The Walk Worldwide will receive your money faster and, if you are a UK taxpayer, an extra 28% in tax will be added to your gift at no cost to you.
If I reach my fundraising target I promise I'll even post the photos on my Facebook page!