Lisa Snowdon Lisa Snowdon

Vroom, vroom - Lisa Snowdon's ready to rev our engines.

Her weapon of choice?

It's a blinking great tank.

Yup, the words Lisa and army don't usually go together.

But George Clooney's ex has sprung an unexpected military look on us.

The 37-year-old star is at the Imperial War Museum in London, sporting some vintage togs in a promotion for The National Lottery Good Causes 2009.

In the shoot, which will raise the profile of Lottery funding to help people like war veterans, Lisa is transformed into a 1940s sweetheart.

Blazers and vampish lipstick at the ready, she sure has what it takes to float our boats, or petrol our tanks...

Ding dong. Let's only hope George ain't crying into his cornflakes at the sight of his former flame's latest reinvention, however temporary it is.

Check out Lisa's look in full, in our gallery of celebs doing vintage glam, below.