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Posted Mon, July 19, 2010 9:45am EDT

Photos! Katy Perry, Vienna Girardi & More — Vote For This Weekend’s Hottest Bikini Babe!

Some of your favorite (Katy) and least favorite (Vienna) stars slipped into sexy swimsuits this weekend!

Whether or not you’re a fan of this bundle of celebs, you can’t deny they all looked ridiculously hot this weekend in their respective swimsuits. AnnaLynne McCord, Vienna Girardi, Paris Hilton and Katy Perry all flashed some skin, and we want to know what YOU think — who looked the hottest?

  1. 90210 star AnnaLynneshowed off her sexy bikini body alongside her hunky BF Kellan Lutz when the two attended Wet Republic in Las Vegas to celebrate AnnLynne’s 23rd birthday July 16.
  2. Former Bachelor winner (turned fame-loving liar) Viennahosted a “Single and Fabulous” party at Las Vegas club TAO over the weekend. Single and fabulous? Hmm… I’d say Vienna is only one of those things. Guess which one.
  3. Parisdid more than just show off her swimsuit. She took it all off to sunbathe on her private yacht while on vacation in Sardinia. You know, because she hates attention.
  4. And last, but certainly not least, Katygave photographers a little show in an adorable black, white and red striped bikini at the Atlantic resort in the Bahamas.

Which bikini babe gets your vote for hottest of the weekend?