Nicholai "Nicky" Olivia Hilton (born October 5, 1983, in New York City, New York) is an American fashion model, socialite, and fashion designer. Hilton is also an heiress to a part of the Hilton Hotels chain, as well as to about 5–15% of her father's real estate fortune and investments. She shares her nickname with her grandfather's brother, Conrad "Nicky" Hilton, who died 14 years before she was born. She is the sister of celebrity Paris Hilton.