The Brokeback Mountain star has become famous for her distinctive pixie cut, and although her six-year-old daughter with Ledger is not a fan of mum's hair, she insists on keeping it as a special tribute to the tragic actor.
She tells Elle magazine, ""What Matilda would love is for her mum to grow out the cropped hair, though that's unlikely to happen any time soon.
""I've really grown into it. I feel like myself with short hair. And it's been a really long time since I had long hair, five years. Of course, the only people who like it are gay men and my girlfriends. Straight men across the board are not into this hair!
""I cut it for the one straight man who has ever liked short hair and I wear it in memorial of somebody who really loved it.""
Williams and Ledger called off their three-year romance in September, 2007. Ledger died the following January (08) from an accidental drug overdose.