Nicky Hilton attends the 2016 amfAR New York Gala at Cipriani Wall Street in Manhattan, New York February 10, 2016. REUTERS/Andrew Kelly

Paris and Nicky Hilton attend the 2016 amfAR New York Gala at Cipriani Wall Street in Manhattan, New York February 10, 2016. REUTERS/Andrew Kelly

Paris and Nicky Hilton attend the 2016 amfAR New York Gala at Cipriani Wall Street in Manhattan, New York February 10, 2016. REUTERS/Andrew Kelly

Paris Hilton (L) and Nicky Hilton arrive at the 2010 MTV Movie Awards in Los Angeles June 6, 2010. REUTERS/Danny Moloshok (UNITED STATES - Tags: ENTERTAINMENT) 

Paris Hilton (L) and her sister Nicky poses with Japanese model Jessica Michibata (C) at a promotional event for Japan's fashion brand Samantha Thavasa's handbags and accessories in Tokyo November 5, 2007. REUTERS/Kim Kyung-Hoon (JAPAN) 

Paris Hilton (L) and her sister Nicky pose at a promotional event for Japan's fashion brand Samantha Thavasa's handbags and accessories in Tokyo November 5, 2007. REUTERS/Kim Kyung-Hoon (JAPAN) 

Hotel heiresses Paris Hilton and Nicky Hilton (R) leave the Luca Luca fashion show at the Spring 2007 Fashion Week in New York September 11, 2006. REUTERS/Keith Bedford (UNITED STATES) 

Hotel heiresses Paris Hilton and Nicky Hilton (R) leave the Luca Luca fashion show at the Spring 2007 Fashion Week in New York September 11, 2006. REUTERS/Keith Bedford (UNITED STATES) 

Hotel heiress Nicky Hilton sits at the Nicole Miller show at the Spring Collections 2007 fashion show in New York September 8, 2006. REUTERS/Keith Bedford (UNITED STATES) 

Nicky Hilton arrives for an after party for the MTV Video Music Awards in New York, August 31, 2006. REUTERS/Keith Bedford (UNITED STATES) 

Nicky Hilton arrives for an after party for the MTV Video Music Awards in New York, August 31, 2006. REUTERS/Keith Bedford (UNITED STATES) 

Sisters Paris (L) and Nicky Hilton arrive at the 2006 MTV Video Music Awards in New York August 31, 2006. REUTERS/Lucas Jackson (UNITED STATES) 

Sisters Paris (L) and Nicky Hilton arrive at the 2006 MTV Video Music Awards in New York August 31, 2006. REUTERS/Lucas Jackson (UNITED STATES) 

Paris (L) and Nicky Hilton arrive at the 2006 MTV Video Music Awards in New York August 31, 2006. REUTERS/Lucas Jackson (UNITED STATES) 

Nicky Hilton attends a special viewing of "Hedwig and the Angry Inch" at the Roxy theatre in West Hollywood, California April 3, 2006. The musical is a story of an east Berlin boy named Hansel, played by Donovan Leitch who undergoes a sex change operation after falling in love with a U.S. soldier. REUTERS/Mario Anzuoni 

Paris (R) and Nicky Hilton attend the Louis Verdad fashion show of the fall 2006 collection at Smashbox Studios in Culver City, California, March 19, 2006. The Los Angeles fashion week for the fall of 2006 begins on Sunday and lasts for five days. REUTERS/Mario Anzuoni 

Paris (L) and Nicky Hilton watch the Louis Verdad fashion show of the fall 2006 collection at Smashbox Studios in Culver City, California March 19, 2006. The Los Angeles fashion week for the fall of 2006 begins on Sunday and lasts for five days. REUTERS/Mario Anzuoni 

Paris (L) and Nicky Hilton pose backstage at the Louis Verdad fashion show of the fall 2006 collection at Smashbox Studios in Culver City, California March 19, 2006. The Los Angeles fashion week for the fall of 2006 begins on Sunday and lasts for five days. REUTERS/Mario Anzuoni 

Nicky Hilton poses on the runaway at the 2 B Free fashion show of the fall 2006 collection at the Regent Beverly Wilshire hotel in Beverly Hills March 17, 2006. Los Angeles Fashion Week for the fall of 2006 begins on Sunday. REUTERS/Mario Anzuoni 

Paris (L) and Nicky Hilton pose backstage before the 2 B Free fashion show of the fall 2006 collection at the Regent Beverly Wilshire hotel in Beverly Hills March 17, 2006. Los Angeles Fashion Week for the fall of 2006 begins on Sunday. REUTERS/Mario Anzuoni 

Nicky Hilton walks the runaway at the 2 B Free fashion show of the fall 2006 collection at the Regent Beverly Wilshire hotel in Beverly Hills March 17, 2006. Los Angeles Fashion Week for the fall of 2006 begins on Sunday. REUTERS/Mario Anzuoni 

Socialite Nicky Hilton attends designer Zac Posen's Fall 2006 fashion show at New York Fashion Week February 9, 2006. REUTERS/Robert Caplin 

Socialite Nicky Hilton attends designer Zac Posen's Fall 2006 fashion show at New York Fashion Week February 9, 2006. REUTERS/Robert Caplin 

Nicky Hilton arrives at the Weinstein Company Golden Globes after-party in Beverly Hills, California January 16, 2006. REUTERS/Mario Anzuoni 

Paris Hilton (L) and Nicky Hilton (R) arrive at the 2005 American Music Awards at the Shrine Auditorium in Los Angeles, November 22, 2005. Paris Hilton is a presenter during the show. REUTERS/Chris Pizzello 

Nicky Hilton and Paris Hilton (R) arrive at the 2005 American Music Awards at the Shrine Auditorium in Los Angeles, November 22, 2005. Paris Hilton is a presenter during the show. REUTERS/Chris Pizzello 

Hotel heiress Nicky Hilton poses at the end of the runway during the 2006 Heatherette spring collection show at Fashion Week in New York September 16, 2005. REUTERS/Shannon Stapleton SS/YH 

Actor Kevin Connolly (R), a cast member in HBO's series "Entourage," arrives with Nicky Hilton for a screening as the series begins its second season at the El Capitan Theatre in the Hollywood section of Los Angeles May 25, 2005. REUTERS/Jim Ruymen JR/AH 

Actor Kevin Connolly (L), a cast member in HBO's series "Entourage," arrives with Nicky Hilton for a screening as the series begins its second season at the El Capitan Theatre in the Hollywood section of Los Angeles May 25, 2005. REUTERS/Jim Ruymen JR/AH 

Nicky Hilton arrives at the Sony PSP party to celebrate the 2005 Electronic Entertainment Expo at the Hollywood Center Studios in Hollywood on May 17, 2005. PHOTO TAKEN ON MAY 17. REUTERS/Gene Blevins GB/SM 

U.S. socialite and model Nicky Hilton poses as she arrives as a guest for the premiere of "House of Wax" in Los Angeles. U.S. socialite and model Nicky Hilton poses as she arrives as a guest for the premiere of her sister Paris' new film "House of Wax" in Los Angeles April 26, 2005. The remake of the classic 1953 horror film also stars Chad Michael Murray and Elisha Cuthbert and opens in the United States on May 6. REUTERS/Michael Tweed 

U.S. socialite and model Nicky Hilton poses as she arrives as a guest for the premiere of her sister Paris Hilton's new film "House of Wax" in Los Angeles April 26, 2005. The remake of the classic 1953 horror film also stars Chad Michael Murray and Elisha Cuthbert and opens in the United States on May 6. REUTERS/Michael Tweed FSP/JJ 

Nicky Hilton arrives for a party celebrating the opening of three Marc Jacobs stores in the Melrose Place neighbourhood in Los Angeles March 17, 2005. REUTERS/Lee Celano LJC/VP 

Orlando business man Fred Khalilian (L) entertainment mogul Lou Pearlman (C) and hotel heiress Nicky Hilton (R) cut the ribbon at the grand opening of Club Paris in Orlando, Florida on December 30, 2004. Paris Hilton was not able to attend the ribbon cutting ceremony due to missing a flight in Europe. Paris, who is lending her name to the club, has also helped design the club interiors and has signed a contract to appear at the club at least twice every month. Future Club Paris locations are slated for Las Vegas, New York City, Miami Beach, London, and Paris. REUTERS/Jason Arnold MS 

Socialite Nicky Hilton arrives as a guest at the Lloyd Klein Fall Winter 2004/2005 fashion show during the Mercedes Benz Los Angeles Fashion Week at Smashbox studios in Los Angeles, March 29, 2004. REUTERS/Fred Prouser FSP 

Socialite Nicky Hilton arrives as a guest at the Lloyd Klein Fall Winter 2004/2005 fashion show during the Mercedes Benz Los Angeles Fashion Week at Smashbox studios in Los Angeles, March 29, 2004. REUTERS/Fred Prouser FSP/GAC 

Socialite Nicky Hilton arrives to the Rodeo Drive Walk of Style Honoring Tom Ford in Beverly Hills, California, March 28, 2004. Ford was honored for his contributions to fashion and entertainment. REUTERS/John Hayes JH 

Socialite Nicky Hilton poses at the InStyle Warner Bros. Studios party after the 61st annual Golden Globe Awards in Beverly Hills January 25, 2004. REUTERS/Fred Greaves FSP 

Socialite Nicky Hilton poses at the InStyle Warner Bros. Studios party after the 61st annual Golden Globe Awards in Beverly Hills January 25, 2004. REUTERS/Fred Greaves FSP 

Socialite Nicky Hilton arrives as a guest for the 10th annual Race to
Erase MS May 9, 2003 in Los Angeles. The event featured a Tommy
Hilfiger fashion show and musical performances which benefited the
Nancy Davis Foundtion for Multiple Sclerosis. REUTERS/Fred Prouser

FSP/CRB 

Socialite Nicky Hilton arrives as a guest for the 10th annual Race to
Erase MS May 9, 2003 in Los Angeles. The event featured a Tommy
Hilfiger fashion show and musical performances which benefited the
Nancy Davis Foundtion for Multiple Sclerosis. REUTERS/Fred Prouser

FSP/CRB 

Scotland's David Hilton (2L) celebrates with Nikki Walker (R) after
their international rugby union test match against South Africa at
Murrayfield stadium in Edinburgh November 16, 2002. Scotland won the
match 21-6. REUTERS/Jeff J Mitchell

JJM/ASA/CMC