Earlier this year, Heath Ledger sold his house on Bronte Beach in Sydney, asking $7 million Australian for the three-level, four-bedroom dwelling overlooking the ocean. Pity. But he’s just paid $2.3 million US for a pied-a-terre in the Hollywood Hills that once belonged to Ellen Degeneres and her Aussie partner Portia de Rossi. Named “The Treehouse,” it sits in a sycamore grove on a half-acre lot and has two bedrooms and two bathrooms in a bit more than 2,000 square feet, with a large teak deck. He’s sharing it with actress Michelle Williams and their new baby, Matilda. The couple also has an apartment in New York.