Mariah Carey to Billionaire BF -- These Boobs Float Your Boat? (PHOTOS)

Mariah Carey's new BF got an eyeful of the goods when she put her girls on display for a super soaked adventure -- oh, and her kids were there too.

MC and James Packer got off his sick yacht long enough to do some jet skiing off the coast of Capri, Italy. The wetsuit never stood a chance against her cleavage though.

Four-year-old twins, Moroccan and Monroe were along for the ride too.