While both have taken the real estate world by storm, Ekaterina remains a modest and relatively unknown character. Her peer, Petra, has an image that is rather more in keeping with her flashy $175million property portfolio.
Ekaterina Rybolovleva is the daughter of well-known oligarch Dmitriy Rybolovlev, the 'potash king' and former owner of fertilizer business Uralkali. Petra's father is Bernie Ecclestone, 81, the British F1 racing mogul.
No doubt the ladies' paths have crossed on the well-heeled, doorman-staffed sidewalks of Monaco, or on the beaches of St Tropez - but whether they'll bump into each other Stateside is another question.

There is no doubt that Ekaterina's millions were not made by her - she is reported to have made just $2,370 in competition wins last year, according to equestrian website, Global Champions Tour, cites the New York Observer.
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