London: 'Brokeback Mountain' star Michelle Williams says she prefers to wear her hair short as a "memorial" to her late ex-fiance Heath Ledger.

The 31-year-old actress, who has become famous for her distinctive pixie cut, insists on keeping it as a special tribute to the tragic actor, according to reports.

"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," she said.

Williams and Ledger called off their three-year romance in September, 2007. Ledger died in January, 2008 from an accidental drug overdose.