Sister of Paris Hilton, Barron Hilton, and Conrad Hilton.
Daughter of real estate mogul Rick Hilton and former actress Kathy Hilton.
Half-niece of Kim Richards and Kyle Richards.
Was offered a starring role in The Simple Life (2003) with her sister Paris Hilton, but turned down the offer because she didn't want to "live the simple life".
Great-niece of Conrad Hilton Jr. (first husband of Elizabeth Taylor) and Francesca Hilton.
Her brief marriage to businessman Todd Andrew Meister was officially annulled by a judge in Las Vegas, where the couple wed in a surprise ceremony attended by her older sister Paris Hilton and Bijou Phillips.
More than 100 stores in Japan sell her handbags.
Turned down starring in the fourth season of The Simple Life (2003) as Nicole Richie's replacement.
Along with Tara Reid, her sister Paris Hilton, Bijou Phillips, Nicole Richie, Kimberly Stewart, Lindsay Lohan & Kim Kardashian West is one of Hollywood's most famous party girls.
The Hilton name is of Norwegian origin. Her great-great-grandfather, August Halvorsen Hilton, was born on the family farm Hilton, at Kløfta, just outside Oslo, Norway, before emigrating to the US with his family at age 10. Her other ancestry is Italian (from a maternal great-grandfather), Irish, German, English, Scottish, and Welsh.
Has a successful line of clothing called Chick By Nicky Hilton, which retails at Kitson stores.
Has been a handbag designer since she was seventeen years of age.
Great-granddaughter of Conrad Hilton and Mary Adelaide Barron.
Went to Convent of the Sacred Heart in NYC's Upper East Side. Other former students were sister Paris Hilton, Lady Gaga, Joanna Philbin, J.J. Philbin.
Dyed her hair back to her natural blonde in August 2005, after being a brunette for two years.
Released another line of clothing as a follow up to her first successful, Chick By Nicky Hilton Line.
Is currently in the works of opening and designing her own line of hotels called, Nicky O, in Miami and Chicago. 
Godmother is Faye Resnick, of O.J. Simpson murder trial fame, and author of the book "Nicole Brown Simpson: The Private Diary Of A Life Interrupted".
Ex-step-great-granddaughter of Zsa Zsa Gabor.
Granddaughter of Kathy Richards.
Cousin of Brooke Wiederhorn and Whitney Davis.
She is godmother of Ava-Monroe Johnson (b.2006), a daughter of her best friend Casey Johnson.
She and her older sister, Paris Hilton, were best friends with Casey Johnson since childhood until Casey's death on January 4, 2010 from diabetes at age 30.
Promoting her new clothing line set for release this spring. [February 2005]
Attended the House of Wax (2005) premiere with older sister, Paris Hilton. [May 2005]
Attending Maxim's Top 100 Party [May 2005]
Attended the Louis Verdad Fashion Show with sister, Paris Hilton. [March 2005]
(July 10, 2015) Married her boyfriend of 4 years James Rothchild at the Kensington Palace following a 11-month-long engagement. This is her second marriage.
Has two daughters with her husband James Rothschild - Lily Grace Victoria Rothschild (b. July 8, 2016) and Teddy Marilyn Rothschild (b. December 20, 2017). Her younger daughter Teddy got her middle name Marilyn after her paternal great-grandmother Marilyn June Hawley.