The cast of "90210" hit the beach to shoot scenes for the upcoming season.

New cast member Kristina Apgar (Jane) was seen smooching a mystery guy while Matt Lanter (Liam) looks on. Also on the beach -- hunky Trevor Donovan and Jessica Stroup.

Click on the "Launch Gallery" button below to see all the photos.

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Do you know who the mystery man is? Tell TooFab in the comments below!

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