Georgina Bloomberg

Cim Christo ridden by Georgina Bloomberg during the Bunn Leisure Queen Elizabeth II Cup, on July 29, 2007, in Hickstead, England.

Equestrian Georgina Bloomberg poses for a portrait during the 2008 U.S. Olympic Team Media Summit at the Palmer House Hilton on April 16, 2008 in Chicago, Illinois.

Cim Christo ridden by Georgina Bloomberg during the Bunn Leisure Queen Elizabeth II Cup, on July 29, 2007, in Hickstead, England.

US rider Georgina Bloomberg jumps a fence, May 6, 2005 in La Baule, France, during the nations cup second leg. The US team won the event ahead of Great Britain and France.

Georgina Bloomberg watches the match between Fernando Gonzalez of Chile and Rafael Nadal of Spain during the 2009 U.S. Open on September 10, 2009 in Queens, New York City.

Georgina Bloomberg attends the Gucci celebration of Fashion's Night Out at Gucci Fifth Avenue on September 10, 2010 in New York City.

Equestrian Georgina Bloomberg poses for a portrait during the 2008 U.S. Olympic Team Media Summit at the Palmer House Hilton on April 16, 2008 in Chicago, Illinois.

Cim Christo ridden by Georgina Bloomberg during the Bunn Leisure Queen Elizabeth II Cup, on July 29, 2007, in Hickstead, England.

Left to Right: Georgina Bloomberg, Diana Taylor, New York Mayor Michael Bloomberg, and Secretary of State-elect Hillary Clinton celebrate New Year's Eve in Times Square on December 31, 2008 in New York City.

Cim Christo ridden by Georgina Bloomberg during the Bunn Leisure Queen Elizabeth II Cup, on July 29, 2007, in Hickstead, England.

Equestrian Georgina Bloomberg answers questions from a member of the media during the 2008 U.S. Olympic Team Media Summit at the Palmer House Hilton on April 16, 2008 in Chicago, Illinois.

Andrew H. Walker/Getty Images for The Buoniconti Fund to Cure Paralysis

Georgina Bloomberg attends the 25th Great Sports Legends Dinner to benefit The Buoniconti Fund to Cure Paralysis at The Waldorf=Astoria on September 27, 2010 in New York City.

Equestrian athlete Georgina Bloomberg and New York City Mayor Michael Bloomberg attend the 31st Annual Salute to Women in Sports gala at The Waldorf-Astoria on October 12, 2010 in New York City.

New York Mayor Michael Bloomberg (R) takes the oath of office administered by New York State Chief Judge Jonathan Lippman as his daughters Emma Bloomberg (L) and Georgina Bloomberg hold the bible January 1, 2010 at City Hall in New York City. Bloomberg launched his third term in office.

New York City Mayor Michael Bloomberg, left, sits with daughter Georgina Bloomberg to watch the match between Fernando Gonzalez of Chile and Rafael Nadal of Spain during the 2009 U.S. Open on September 10, 2009 in Queens, New York City.