Demi Moore & Martha Stewart Party on Russian Billionaire's Megayacht

Demi Moore, Ashton Kutcher and Martha Stewart made the New Year's scene in St. Barths as guests of Russian billionaire Andrey Melnichenko aboard his Philippe Starck-designed megayacht 'A' (above). The awe-inspiring 390-ft. craft ranks as the 11th largest yacht in the world and cost an estimated $300 million to build. The celebs were in town for oligarch Roman Abramovich's star-studded New Year's Eve bash featuring the Black Eyed Peas at his lavish estate on the island. While on board the yacht Moore strutted around in a barely-there bikini and caught some rays.

She and Kutcher also played around on the vessel's jet skis. The yacht's interior features $40,000 bath faucets, $60,000 stair banisters, and an all-white, 2,583-sq.-ft. master suite wrapped in bulletproof glass and accessed by a silver-plated staircase with a fingerprint scanner at the door. Key decor accents include Baccarat crystal tables, alligator skin and Kudu horn chairs, stingray skin upholstered walls and hand-stitched leather paneling. Filling the A's gas tanks alone costs $500,000 a pop and running costs come to about $20 million a year.