- She is the second cousin, once removed, of King Charles III, the King of the United Kingdom of Great Britain and Northern Ireland. Her great-granduncle, Prince Andrew of Greece, is King Charles's paternal grandfather.
- Was named after her ancestress, Catherine the Great (Empress Catherine II, Tsarina of Russia).
- Father is Howard Oxenberg. Mother is Princess Elizabeth of Yugoslavia. Catherine's father was from an Ashkenazi Jewish family, from Russia. Catherine's mother's ancestry includes Serbian, Russian, Finnish, Swedish, and European Royal.
- 1999: Married Casper Van Dien in Las Vegas by a minister dressed as Elvis Presley. They later had an Indian ceremony under an Indian saint called Amma.
- Her 1998 marriage to Robert Evans lasted 9 days.
- As of 2009, is #1387 in the line of succession to the British throne, as daughter of Princess Elizabeth of Yugoslavia, granddaughter of Princess Olga of Greece and Denmark, and great-great granddaughter of King George I of Greece.
- Was in the same high school class as Judd Nelson.
- 1985: Named on Harper's Bazaar list of "America's 10 Most Beautiful Women".
- Speaks fluent French and Spanish
- Sister- Christina Oxenberg (born 1962), Half-brother- Nicholas Balfour (born 1970), from her mother's second marriage. Princess Elizabeth of Yugoslavia was also engaged to actor Richard Burton.
- Casper Van Dien gave her an 8.3 carat diamond engagement ring with 92 yellow diamonds around the band.
- Had brief romance with John Kerry who was US secretary of state 2013-2017.
- Gave birth to her 2nd child at age 39, a daughter named Amanda Maya Van Dien (aka Maya Van Dien) on September 20, 2001 in Los Angeles, CA. Child's father is her 2nd husband, Casper Van Dien.
- Continued to work as a model when she was not making regular appearances on Dynasty (1981).
- 1979: Graduated from St. Paul's School in Concord, New Hampshire.
- (September 26, 2015) Her 2nd husband of 16 years Casper Van Dien filed for divorce from her earlier this week.
- Gave birth to her first child at age 29, a daughter named India Riven Oxenberg (aka India Oxenberg) on June 7, 1991. In 2017, it was known that her father is William Weitz Shaffer.
- Gave birth to her 3rd child at age 42, a daughter named Celeste Alma Van Dien (aka Celeste Van Dien) on October 3, 2003. Child's father is her 2nd husband, Casper Van Dien.
- She is 7 years older than her 2nd husband Casper Van Dien.
- The first cousin of the Duke of Kent she began modeling at 4 when she was photographed by Cecil Beaton and when older enrolled for a two year method acting course in Los Angeles based on Lee Srasbourg's techniques.
- Former sister-in-law of Damian Elwes.
- Cousin of Prince Dimitri of Yugoslavia, a former gem expert at Sotheby's.
- 1/05: She and husband Casper Van Dien renewed their vows with his mother, Diane Van Dien, (an interfaith minister) presiding over the ceremony on the beach.
- Parents were Princess Elizabeth of Yugoslavia and Howard Oxenberg. a New York garment manufacturer.
- Catherine has a daughter named Amanda and portrayed a character named Amanda on the original Dynasty soap opera.
- Wears a size 7 shoe.
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