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Scarlett Johansson, Rihanna, Julia Roberts, Leighton Meester
Credit: Splash News (2); TheGreenTeam / Splash; AKM-GSI

Today is World Oceans Day, and to mark this global celebration of ocean conservation, we’ve rounded up snapshots of our favorite stars working their hottest bikinis at the beach. See what Scarlett Johansson, Rihanna, Julia Roberts, Leighton Meester, and more celebs wear to soak up those sunny rays in the gallery.