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On Thursday evening Katie Holmes and Jessica Biel attended the Tiffany & Co. Blue Book Celebration at the Guggenheim Museum in New York City, and the ladies looked amazing when they posed for photographers.

Katie wore a short black Balenciaga dress while Jessica wowed in an Oscar de la Renta frock, and of course, they both rocked bling from Tiffany's. Wonder if they got to keep it?

Kate Bosworth was also at the event, but rather than keeping it simple in a LBD, she went for the prom princess look with this baby pink gown:

New York Kate Bosworth Tiffany Debut 2014 Blue Book