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Rachel Bilson and Hayden Christensen's romantic vacation, plus more celebs on the beach!

By Katie Mathewson Slide 1 of 15

It's April in California, which means that it's basically summer. That means that the stars have been bikini-ready for weeks and are flocking to the beaches for sun, sand, and surf. And when California's coastline doesn't cut it, there's always international waters. Join us as we dive right in to these sexy celebrity pics!RELATED:Best off-season bikini bodsRachel Bilson and boyfriend Hayden Christensen heated up an already warm beach during their romantic vacation in Barbados. The smiling lovebirds enjoyed a swim in the ocean with friends before relaxing on the sand.
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