5 Stars With Billionaire Boyfriends or Husbands

It's been an exciting Summer for Mariah, 45, and James, 47. They first showed off their romance during a European getaway in June. According to an Us Weekly source, "James was interested in Mariah right when he heard she had split" from Nick Cannon in January.

Given his reported $3.9 billion net worth, their pricey Summer rental in Malibu, CA, is a drop in the bucket for the Australian businessman. Of course, Mariah could easily live the good life on her own — one estimate puts her worth at over $500 million.