Started a property empire with a loan of £6,000 from their grandmother in 1995. Now said to be worth anything upto £13 billion, this pair are most famous for their One Hyde Park development next to The Mandarin Oriental. London based Nick is married to the Australian singer and former Neighbours actress Holly Valance whilst Monaco based Christian is married to a former “It-girl” named Emily Crompton. In one interview Nick was quoted as saying: “We’ve probably got about 10 cars”. With this much wealth, what’s a car between friends?