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Nicky Hilton
has a lot to celebrate!

The heiress just launched her new book, "365 Style," and celebrated with her sister Paris Hilton and aunts Kyle Richards and Kim Richards at Kyle's store Kyle by Alene Too in Beverly Hills on Tuesday.

Nicky and Paris posed for pics together at the party and then joined their famous family members for a group shot.

Kim, Kyle, Paris, Nicki and Kathy Hilton posed outside of Kyle's boutique as Nicky proudly held up her new book.

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But the Richards sisters weren't the only "Real Housewives of Beverly Hills" stars at the event -- Lisa Vanderpump and Camille Grammer also joined their Bravo costars at the launch.

The "Real Housewives of Beverly Hills" cameras were also on-hand -- so we'll probably get the inside scoop of what really went down when the new season premieres.

Will you be reading Nicky's new style book? Sound off below and check out the gallery above to see more photos from the star-studded night!
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