Kellan Lutz and AnnaLynne McCord in St. Maarten: Bathing Suit Beauties

It's unclear whether or not Kellan Lutz and AnnaLynne McCord are officially dating.

But this much is not up for debate: both look smokin in a bathing suit!

The on-again-off-again couple appears to be on again, as they vacationed in St. Maarten together this weekend. They were accompanied by McCord's sister, Angel, who we cropped out below. For what reason?

So fans could focus their eyes on the alluring bodies of the 90210 and Twilight Saga stars, respectively.

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Kellan has signed on for a couple of non-vampire roles in the near future: he'll soon shoot Love, Wedding, Marriage, which co-stars Mandy Moore, James Brolin and Jane Seymour.

From there, it's on to War of the Gods, opposite Henry Cavill, Mickey Rourke and Freida Pinto. In between, he'll do press for a little movie called Eclipse. Maybe you've heard of it.