Antonia Kidman leaves her sister Nicole Kidman's house after a short visit in Sydney January 10, 2008. REUTERS/Patrick Riviere (AUSTRALIA) 

Antonia Kidman leaves her sister Nicole Kidman's house after a short visit in Sydney January 10, 2008. REUTERS/Patrick Riviere (AUSTRALIA) 

Antonia Kidman leaves her sister Nicole Kidman's house after a short visit with her daughter Lucia in Sydney January 10, 2008. REUTERS/Patrick Riviere (AUSTRALIA) 

Australian actress Nicole Kidman's sister Antonia arrives on the red carpet during the Australian premiere of "The Golden Compass" at the State Theatre in Sydney December 16, 2007. REUTERS/Patrick Riviere (AUSTRALIA) 

Australian actress Nicole Kidman's sister Antonia (R) arrives with her daughter Lucia (C) and a friend on the red carpet during the Australian premiere of "The Golden Compass" at the State Theatre in Sydney December 16, 2007. REUTERS/Patrick Riviere (AUSTRALIA) 

TV host Antonia Kidman attends the David Jones Summer 2007 Collection launch at the Royal Hall of Fame in Sydney August 7, 2007. REUTERS/Patrick Riviere (AUSTRALIA) 

TV host Antonia Kidman attends the David Jones Summer 2007 Collection launch at the Royal Hall of Fame in Sydney August 07, 2007. REUTERS/Patrick Riviere (AUSTRALIA) 

Nicole Kidman's sister Antonia and her unidentified daughter wave as they arrive at Saint Patrick's estate to celebrate Nicole Kidman's wedding to country singer Keith Urban in Sydney June 25, 2006. REUTERS/Will Burgess (AUSTRALIA) 

Antonia Kidman reacts as photographers try to photograph her reversing out of the garage of her sister [Nicole] Kidman's house in Sydney June 23, 2006. 

Antonia Kidman looks up as she waits for a garage door to open as she arrives at her sister[Nicole] Kidman's house in Sydney June 23, 2006. 

Antonia Kidman reacts as photographers try to photograph her reversing out of the garage of her sister Nicole Kidman's house in Sydney June 23, 2006. REUTERS/Will Burgess (AUSTRALIA) 

Antonia Kidman looks up as she waits for a garage door to open as she arrives at her sister Nicole Kidman's house in Sydney June 23, 2006. REUTERS/Will Burgess (AUSTRALIA) 

Antonia Kidman, sister of actress Nicole Kidman, leaves her sister's house in Sydney, June 22, 2006. Nicole Kidman and country music star Keith Urban arrived in Australia on Monday saying they had returned to Australia to be married. REUTERS/Will Burgess (AUSTRALIA) 

Actress Nicole Kidman (L) poses with her sister Antonia at the 74th Annual Academy Awards in Los Angeles, California on March 24, 2002. Kidman is nominated for Best Actress for her role in "Moulin Rouge."
REUTERS/Fred Prouser

AL 

Actress Nicole Kidman (L) speaks to her sister Antonia at the 74th
Annual Academy Awards in Los Angeles, California on March 24, 2002.
Kidman is nominated for Best Actress for her role in "Moulin Rouge."
REUTERS/Win McNamee

AL 

Australian born actress Nicole Kidman arrives with her sister Antonia
at the 74th Academy Awards March 24, 2002 in Hollywood. Kidman is
nominated for Best Actress for her performance in the film "Moulin
Rouge". REUTERS/ Fred Prouser

MB/ME 

Actress Nicole Kidman (L) speaks to her sister Antonia at the 74th Annual Academy Awards in Los Angeles, California on March 24, 2002. Kidman is nominated for Best Actress for her role in "Moulin Rouge."