Guinness was planning to study music after high school, but at 19 met Niarchos during a skiing holiday.
Their marriage when Daphne was just 19 years old was something of society scandal at they time.
After their highly publicised nuptials she disappeared from public life making rare cameos at the Chanel and Valentino couture shows in Paris.
They have three children: Nicolas Stavros (b. 1989), Alexis Spyros (b. 1991) and Ines (b. 1995).
The couple divorced in 2000, in which she reportedly received a $39 million settlement and relocated back to London where her friends welcomed her with open arms.