It may just be summer outside, but OP is already turning their stylish eye towards going back to school in the fall. And they’ve rounded up some of Hollywood’s hottest young stars for their “OPen Campus” campaign including 90210’s AnnaLynne McCord, Sophia Bush, Solange Knowles, Joel Madden, Brody Jenner and Cody Linley. The cast not only got to hang out with each other — Solange even brought her adorable son by for a visit to the set! — but they got to pose on a custom OP bus, created by West Coast Customs, that has everything from a performance stage on the roof to recycled cork floors to a built-in gaming system. While posing for photographer Larry Bartholomew at University High School in Los Angeles, the girls bonded over gossip in the bus while Cody and Brody palled around on skateboards between takes Op is exclusively available at Walmart.