Surfer-dude hair and scruffy whiskers? Gone. Bachelor pad in Los Feliz, Calif.? Sold. At 26, the Aussie actor and erstwhile teen heartthrob is moving on, and yes, maturity becomes him. With partner Michelle Williams, Ledger’s now dad to Matilda, born in October, and he’s upping the stakes onscreen, riding roughshod over sexual taboos in the forthcoming Brokeback Mountain.