Lindsay Lohan celebrated her newfound freedom at the Chateau Marmont yesterday afternoon — right across from her ex, Samantha Ronson. The DJ was spotted at a table with friends at the historic Los Angeles hotel having lunch. Then Lohan walked in with her sister, Ali, and was seated at a table nearby. A spy said that neither one made eye contact, and Ronson — who friends say recently broke up with her girlfriend, Erin Foster — left 10 minutes after the Lohans arrived. Yesterday morning, an LA Superior Court judge told Lohan her supervised probation from a 2007 DUI case was done, with the judge reportedly saying as the actress left court, “Stop night-clubbing and focus on your work.”