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In their latest “Back To College” ad campaign, Op tapped enough young Hollywood stars to cast an entire TV show. For the second time since their debut “Rock Your Shine” campaign, Glee‘s Dianna Agron and Cory Monteith joined Gossip Girl star Jessica Szohr, 90210‘s Trevor Donovan (looking remarkably like a Ken doll) and singer Cassie for a fun-filled photo shoot; the clothes—which are exclusively sold at Walmart—seem quite perfect for lounging in the quad. “I love the plaid shirts!,” said Agron. “All of the fall clothing from Op is perfect for hanging out on campus.” Click to see more photos of Op’s “Back to School” campaign and check out a behind-the-scenes video after the jump.