Yacht vs. yacht

Only in Cannes do you overhear, "Sorry, I'm late. I got stuck on this yacht." By the height of the festival, the azure horizon is studded with floating sea monsters. (Legend has it that Errol Flynn moored his own yacht here in 1949 and demanded that the recreational flotilla leave the dock, lest those boats draw attention away from him.) Fashion royalty Alberta Ferretti and Roberto Cavalli are not so proprietary about the port, since both entertain every year at Cannes on their respective yachts. And much like the designers' collections, their massive boats are cut from decidedly different cloth.

Name

Prometej. Ferretti inherited the name, which is Russian for Prometheus, the Titan who stole fire from Zeus. Here in Cannes, Ferretti hopes to steal a few flashbulbs herself.

The Stats

Ferretti's 147-foot, black-hulled behemoth -- with six cabins that can sleep 12 -- looks as if it could split Cavalli's yacht in half. The former Soviet "icebreaker" was built in Romania in the 1950s and commissioned to sail the Black and Baltic seas.

Statement

Ferretti credits the strong, modern female as her muse and says that "women today can have it all." With a masseuse on staff and a Turkish bath aboard Prometej, she's not kidding. "My boat is for my guests," she says. "I love to entertain."

Distinctive decor

Ferretti looked to nature and conceptual artists to outfit her boat with organic touches of coral, sea life and a subdued neon installation. Even the walls of the cabins are covered in organic raw silks and linens. Gilded Balinese furniture and vividly tiled bathrooms add accents of drama.

Secret soak

An oversized traditional hot tub on the uppermost deck ensures either the worst sunburn ever or a leisurely midnight ogling of Orion.

Signature fete

This year, Ferretti hosted the "Che" after-party for Steven Soderbergh's latest film, and cast members, including Julia Ormond and Benicio Del Toro, overtook the upper and lower decks to celebrate.

Nautical terms

"I wanted a house on a boat that would be comfortable and elegant and natural, but not like a big, luxury villa," Ferretti says. "The open deck is perfect for a party because there is so much space."

Roberto Cavalli. The designer named his boat after himself, which makes it, in essence, a logo afloat. It also makes it easy for revelers to find the after-parties he hosts.