Before Lindsay Lohan acceded to a judge�s orders, agreeing to enter 90 days of court-mandated lock-down rehab in New York on May 1, the struggling ingenue made an unusual detour: the backstage artists� village at the Coachella Valley Music and Arts Festival in Indio. In a cordoned-off enclosure that has provided a fertile environment for every stripe of rock 'n' roll excess over the years, Lohan was spotted kicking it Friday night with her 16-year-old brother, Cody, prior to Blur�s 10 p.m. set. But Lilo was far from the only celebrity caught Coa-chillin� over the festival�s first weekend. COACHELLA: Festival photos since 2004 | Day 3 photos Also on Friday, in matching his and hers hoodies, rock-loving couple Robert Pattinson and Kristen Stewart were seen holding hands and swigging Gatorade during Jurassic 5�s reunion set at the Outdoor Stage. In a separate but not unrelated development, model Liberty Ross -- ex of �Snow White and the Huntsman� director Rupert Sand...