Singer Rihanna in a sexy bikini

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Here are some of the Hollywood hotties at their bikini best...

Singer Rihanna strikes a seductive pose on the beach in Marathon Key, Florida. (Getty Images/Frank Micelotta)

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Ageless hottie Madonna flaunts her hot-bod in a sexy black bikini, as she lies on a beach in Sardinia, Italy. (Getty Images/Daniel Smith)

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Audrina Patridge in that sizzling black printed bikini surely makes for a stealer, as she strikes a sexy pose at Las Vegas, Nevada. (Getty Images/Denise Truscello)

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Eva Herzigova looks irresistible as she dons a pure and pristine white bikini while enjoying at a beach in Varigotti, Italy. (Getty Images)

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Paris Hilton sports a sassy look in that halter bikini as she enjoys on a beach. (Getty Images/Amy Graves)

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Singer Rihanna strikes a seductive pose on the beach in Marathon Key, Florida. (Getty Images/Frank Micelotta)

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Actress Lindsay Lohan does it the trendy way, as she dons a black bikini-top along with her sexy sunglasses during her 21st birthday celebration in Malibu. (Getty Images/Kevin Mazur)

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The stunning Jennifer Lopez looks uber-hot as she poses in a white bikini on a beach at Club Med in the Bahamas. (Getty Images/Barry King)

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Kim Kardashian sizzles in a classy black bikini on Miami Beach in Florida. (Getty Images/John Parra)

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Britney Spears just gets it right in a strapless polka bikini while enjoying the sun at Bondi Beach. (Getty Images/Patrick Riviere)