Hilton, 41, and Vallance, 43, teamed up to create a line of glittery garments for Vallance’s namesake label, including 31 mini dresses equipped with bows, elegant details and sheer silhouettes.

Nicky also told Us that her sister, Paris Hilton, wanted to wear the same blue dress to the party but wound up in a red version instead. “I was like, ‘No, it's my party,’” Nicky joked.