Nicholai Olivia `` Nicky '' Hilton ( born October 5 , 1983 ) is an American businesswoman , fashion model , socialite , celebutante , heiress and fashion designer .
Nicholai `` Nicky '' Olivia Hilton ( born October 5 , 1983 , in New York City , New York ) is an American fashion model , socialite , and fashion designer .