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Paris Hilton is showing that 30 is definitely sexy!

With a spread that goes from the bathtub to the backyard ... and eventually to a night out on the town, the heiress looks stunning in the Spring/Summer issue of VS Magazine.

Even though today is actually her birthday, Paris celebrated her special day earlier this week with 300 friends at a private home in Hollywood ... and her red showgirl costume was to die for!

Happy Birthday, Paris!

See Paris in her birthday suit ... after the jump.