Nicholai Olivia Rothschild (née Hilton; born October 5, 1983) is an American businesswoman, socialite, model and fashion designer. She is a member of the Hilton family by birth, and a member of the Rothschild family through her marriage to James Rothschild, a grandson of Victor Rothschild, 3rd Baron Rothschild, in 2015.
Hilton was born in New York City and raised in Los Angeles. She is the younger daughter of Richard Hilton, a hotel heir of the Hilton family who works as a businessman in real estate, and of Kathy Hilton (née Avanzino), a former actress and half sister of Kim and Kyle Richards. Hilton was named for her granduncle, Conrad Nicholson Hilton, Jr. She is the second of four children: she has an older sister, Paris Whitney Hilton (born 1981), and two younger brothers, Barron Nicholas Hilton II (born 1989) and Conrad Hughes Hilton III (born 1994).
Hilton was raised Roman Catholic. She has Norwegian, German, Italian, English, Irish, and Scottish ancestry. Hilton graduated from Convent of the Sacred Heart, an all-girls Catholic school on the Upper East Side, in 2001. She took courses at Fashion Institute of Technology and Parsons The New School for Design but does not have a degree.