Suddenly single, Lachey takes care of business in L.A. Plus: Jennifer Aniston, Gwyneth Paltrow, Heath & Michelle and more

HI, MOM & DAD!

Heath Ledger and girlfriend Michelle Williams leave 1-month-old baby Matilda home for a Wednesday night out in New York. The Brokeback Mountain costars celebrated their film's nomination for best feature at the 15th Annual Gotham Awards. (Capote took the honor.)