Toni Collette as Fiona, a struggling single mom, in 'About A Boy'

The Aussie actress thinks she looks good with shorn hair, and has often shaved it all off on the spur of the moment.

She explains, "The first time I turned 25, I was in Mexico and there was tequila involved.

"The second one was for a PETER GREENAWAY film, then a friend of mine is a designer and I was modelling in a show of her's and we'd actually been in Nepal together and her line was inspired by the people of Nepal, so right before I was going out we shaved it.

"Then, when I met my husband, a week later I shaved it - I think that was some kind of weird test I was putting him through."