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For their CW series, the stars of 90210 showed off some skin on set for scenes being filmed for the show. AnnaLynne McCord and Jessicas Stroup and Lowndes are comfortable donning bikinis with photographers lurking nearby, so it should come as no surprise to see them showing off some beach-ready bodies during filming.

While the girls stuck with tiny summer outfits, it was Trevor Donavan who revealed the most. The young star peeled off his wetsuit to reveal some cheesegrater abs underneath. Parmesan, anyone?

Gallery Info: AnnaLynne McCord, Jessica Lowndes, Jessica Stroup and Trevor Donovan strip down on the set of 90210.