Estimated Net Worth: 60 million pounds ($96 million)
This Los Angeles native moved to London to be with her boyfriend, a month after meeting him at Notting Hill Carnival. After a stint working at fashion magazine, Tatler, Massenet went freelance to set up Net-a-Porter.com. The luxury fashion website, which sells brands like Alexander McQueen, YSL and Proenza Schouler, was one of the first of its kind and went on to be one of the most successful start-ups of the 2000s.
Massenet sold her stake in Net-a-Porter.com to Swiss luxury group Richemont earlier this year, netting herself 50 million pounds ($80 million) from a business valued at 350 million pounds ($560 million). She now heads the British Fashion Council and has expanded her online retail empire into TheOutnet.com and MrPorter.com.