She made her acting debut with sister Paris Hilton, in the National Lampoon's Pledge This!.
She has recently modeled for Frederick's of Hollywood in Fall 2006.
She moved between several homes in her youth, including a suite in the Waldorf-Astoria Hotel in Manhattan, Beverly Hills, and The Hamptons on Long Island, New York.
She has been dating David Katzenberg since October 2006.
She has been linked socially with A-List doorman Andrew Brin.
She will star in a cartoon about her life along with sister Paris and dog Tinkerbell.
In 2006, she is in a partnership for Nicky O hotel. The first, the Nicky O South Beach, is a 94 unit suite condo hotel in Miami set to open in November. It will feature suites by famous designers such as Roberto Cavalli, Nicole Miller, Heatherette, and Betsey Johnson.
Nicky and sister Paris produced such great results, that their handbags could be found in select stores and won over celebrity fans like Britney Spears, Tara Reid and Pamela Anderson.
She contributes to the Free Arts for Abused Children Foundation.
In 2005, Hilton, along with Kimberly Stewart, was the face of Australian underwear line, Antz Pantz. Stewart remains contracted, however Hilton has since been replaced by Australian up-and-coming model Meagan Maitland.
She dated Lost star Ian Somerhalder in 2003 and as of January 2006 was dating Entourage star Kevin Connolly.
Her primary activities involve modeling, personal appearances, and designing handbags, and these activities earn Nicky nearly $1,000,000 USD per year.
Nicky and sister Paris Hilton are known for their jet-set lifestyles, though Nicky has kept a lower profile.
Currently, her parents own a $10,000,000 USD mansion in Bel Air, California, a $6,300,000 USD estate in The Hamptons, as well as a $3,000,000 USD home in the Hills of Hollywood in which Nicky and her sister, Paris, live to give them privacy and easy access to the L.A. clubs they love to frequent.
The current net worth of Barron Hilton is estimated at just over 1,000,000,000 USD, of which Nicky is expected to inherit around $50,000,000 USD.
She shares her nickname with her grandfather's brother Conrad "Nicky" Hilton, who died 14 years before she was born.
Her paternal grandparents are Barron Hilton and Marilyn Hawley.
She was the second of four children born to Richard Hilton and Kathy Richards. Her sister and brothers are Paris Hilton, Barron Hilton and Conrad Hilton.
She is an heiress to a part of the Hilton Hotel chain, as well as to about 5%-15% of her father's real estate fortune and investments.
She likes to play card games on-line when she can't sleep at night.
She is the great-granddaughter of Conrad Hilton and Mary Adelaide Barron.
She graduated high school from the Convent of the Sacred Heart in NYC Upper East Side.
More than 100 stores in Japan sell her handbags.
Nicky started to design handbags at the age of 17.
She attended college at the Fashion Institute of Technology and Parsons School of Design, but did not finish her fashion degree.
Her shoe size is 9 (40 in Europe).
The Hilton name is of Norwegian origin. Her great-great-grandfather August Halvorsen Hilton was born at Kløfta, just outside Oslo, Norway, before emigrating to the US with his family at age 10.
She dyed her hair back to blonde in August 2005, after being a brunette for two years.
She is 5' 7" (1.70 m) in height.
Her nickname as a child was Chick, which is what she named her clothing line after. It is available at Kitson stores.
Nicky Hilton: When I was a kid I had this funny blonde hair and everyone called me 'Chick' because I looked like Tweety Bird.
Nicky Hilton: When I signed the license, I thought the media wasn't going to pick up on it if I used my real name, Nicholai Hilton. Then I got home and turned on CNN and saw the story on the news ticker.
Nicky Hilton: Paris is really young at heart - I'm the older one in the relationship. I'm always telling her not to do stuff. If she's wearing something really silly, I'm like, "Don't go out wearing that."
Nicky Hilton: Our main demographic is 12 (years old) to 30 (years old), but I've had women in their 50s come to my signing wearing pieces from the collection.
Nicky Hilton: I could have just received royalty checks every month by lending my name to a collection, but I didn't want to do that. My name is a reflection of me.
Nicky Hilton: My fashion philosophy is that if I like it, I wear it. I'm not a snob about which looks are 'this season' and which are 'last season.'
Nicky Hilton: (On the first and only job she's ever had.) I interned at Hamptons magazine. I was 12. I walked around with a pad and was like, 'What do you guys want for lunch?' to all the people who worked there.
Nicky Hilton: I love online gambling. At night when I can't sleep, I play blackjack online until I get tired or I lose my money.
Nicky Hilton: My friend Nicole Richie is also engaged, so I'm in the bridal party for that one, too.