Clad in a black satin dress, stiletto heels and wearing bright red lipstick, the princess unveiled heavily bejeweled, brightly colored dresses which fell off mannequins' shoulders in an exhibit hall just outside the center of Moscow.

"It's avant garde, and draws on passion from the 1980s, it's a blend of old and new. I think Russians will like it," said Henri Young, sales director of Thai property developers Raimon Land, who are sponsoring the event.

The 21-year old, U.S.-educated princess shot a bewitching smile at photographers but refused to talk or give interviews.

"It's wearable, that's why we like her. She's the most fashionable young princess, the most fashionable of the royal family," Bangkok-born actress Angie Hastings, who flew over to support the princess, told Reuters.

Princess Sirivannavari Nariratana of Thailand cuts a ribbon during the opening ceremony of the Russian Fashion Week and presentation of her collection in Moscow October 28, 2008. REUTERS/Alexander Natruskin