Brody Jenner, AnnaLynne McCord, Sophia Bush, Joel Madden, Solange Knowles and Cody Linley are all going back to school -- for clothing company Op's "OPen Campus" campaign.

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The latest campaign featuring the stars showcases them getting ready for the back-to-school season on a custom Op bus. The ads will debut this fall in magazines and online.

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"The Op clothes are so cool," Jenner said in a statement. "This is what I wear on an everyday basis in Malibu. I also enjoyed the Op bus. It has lots of old-school Op decorations. I wish I had this bus in high school!"

The vintage bus, which was retro-fitted with a performance stage on the roof, recycled cork floors, solar panels, Op-decorated skateboards and surfboards and a brand-new gaming system, will also be fetured on TLC's West Coast Customs later this summer.

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Between takes, Jenner and Disney star Linley palled around on the skateboards while the women -- including One Tree Hill star Bush and 90210's McCord chatted on the bus.

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"Op is all about having fun," said McCord, who also appeared with the other stars in Op's summer beach campaign. "The cast is now great friends and we had a lot of fun shooting this campaign and showing off what’s going to be in style for back to school."

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