Mariah Carey Dating Billionaire James Packer (PHOTO)

Mariah Carey has got a new boyfriend, TMZ has learned, a billionaire who's the 4th wealthiest person down under.

The guy is James Packer, a 47-year-old entertainment mogul who sold a media company and now owns a string of hotels and casinos around Australia and other countries. He's worth an estimated $4.6 billion, according to Forbes.