PHOTO: VIPHOTO/EAST NEWS 15.09.2010 PREMIERA FILMU BIALA I STRZALA PODBIJA KOSMOS W 3D W MULTIKINIE ZLOTE TARASY N/Z: PATRICIA KAZADI

PHOTO: PIOTR WYGODA/EAST NEWS 22/11/2010 WARSZAWA PREMIERA BAJKI DISNEY'A DLA DZIECI PT. "ZAPLATANI" N/Z: PATRICIA KAZADI PATRYCJA Z RODZENSTWEM

Sisters Haylie, left, and Hilary Duff arrive for the 4th Annual GM

Acting sisters Hilary Duff, left, and Haylie Duff appear at a promotional kickoff of their Icebreakers' Liquid Ice mints national advertising campaign in New York, Thursday Feb. 17, 2005. (AP Photo/Bebeto Matthews)

December 31, 2006 - Miami Beach, FL: Hilary and Haylie Duff celebrates New Year's Eve at Mansion in South Beach. 31.12.2006 Fot. Sara Jaye Weiss/face to face/Reporter

Hilary Duff and Haylie Duff arrive at Teen People 2nd Annual Young Hollywood Issue Celebration held at the Cabana Club on August 13, 2005 in Hollywood, Ca (AP Photo/Luis Martinez)

Top model Gisele Bundchen, accompanied by sister Patr?cia (left), during interview at Caesar Park Hotel, in Ipanema, Rio de Janeiro, southeastern Brazil, January 19, 2007 - Photo: Marcos D' Paula/Agencia Estado/AE

Top model Gisele Bundchen, accompanied by sister Patr?cia (left), during interview at Caesar Park Hotel, in Ipanema, Rio de Janeiro, southeastern Brazil, January 19, 2007 - Photo: Marcos D' Paula/Agencia Estado/AE

Miley Cyrus and sister Brandi Cyrus attend the MTV Video Music Awards on Thursday, Sept. 6, 2012, in Los Angeles. (Photo by Jordan Strauss/Invision/AP)

Actress and singer Miley Cyrus arrives with her sister, actress Noah Cyrus (R) at the premiere of "Justin Bieber: Never say Never" in Los Angeles, California on February 8, 2011. AFP PHOTO / GABRIEL BOUYS

Actress Blake Lively poses backstage at "12-12-12" The Concert for Sandy Relief at Madison Square Garden on Wednesday Dec. 12, 2012 in New York. (Photo by Evan Agostini/Invision/AP)

Pictured: Robyn Lively Mandatory Credit ? Ann Porter/Broadimage "Green Lantern" Los Angeles Premiere 6/15/11, Hollywood, California, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com

AnnaLynne McCord and sister Rachel McCord attend a party to celebrate the newest cast members to join the cast of the Off Broadway show "Love, Loss, and What I Wore" at B. Smith's Restaurant in New York, 28.04.2011. Credit: Rolf Mueller/face to face face to face/Reporter

"90210" star Annalynne McCord and sister Rebecca McCord kick off Women's Rebuild for the St. Bernard Project at the Pure Nightclub at the Caesars Palace Hotel and Casino in Las Vegas, Nevada on 01.10.2011 Credit: MWHW/face to face fot. Face to Face/Reporter

PHOTO: EAST NEWS/AFP Spanish-born Hollywood actress Penelope Cruz (L) poses for photographers with her younger sister Monica (R) during a press preview of their creations, bags and jewelry, at the Samantha Thavasa Japan Limited headquarters in Tokyo, 28 February 2006. Penelope and Monica Cruz were choosen as the promotional models and designers for Samantha Thavasa's 2006 Spring and Summer productions.

PHOTO: EAST NEWS/AFP Spanish-born Hollywood actress Penelope Cruz (L) poses for photographers with her younger sister Monica (R) during a press preview of their creations, bags and jewelry, at the Samantha Thavasa Japan Limited headquarters in Tokyo, 28 February 2006. Penelope and Monica Cruz were choosen as the promotional models and designers for Samantha Thavasa's 2006 Spring and Summer productions.

PHOTO: EAST NEWS/AFP Spanish-born Hollywood actress Penelope Cruz (L) poses for photographers with her younger sister Monica (R) during a press preview of their creations, bags and jewelry, at the Samantha Thavasa Japan Limited headquarters in Tokyo, 28 February 2006. Penelope and Monica Cruz were choosen as the promotional models and designers for Samantha Thavasa's 2006 Spring and Summer productions.

Catherine, Duchess of Cambridge and her sister Pippa Middleton (L) react while watching the action from the Royal Box of the men's singles final match between Britain's Andy Murray and Switzerland's Roger Federer on Centre Court on day 13 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 8, 2012. AFP PHOTO / LEON NEAL RESTRICTED TO EDITORIAL USE

Pictured: Mary-Kate Olsen, Ashley Olsen Mandatory Credit ?? Broadimage 2012 Fresh Air Fund Salute To American Heroes 6/1/12, New York, New York, United States of America Broadimage Newswire Los Angeles 1+ (310) 301-1027 New York 1+ (646) 827-9134 sales@broadimage.com http://www.broadimage.com

Twin actresses Mary-Kate, left, and Ashley Olsen pose for a photo April 18, 2004, in Los Angeles. The sisters who began their careers at the age of nine months on the television sitcom