Mexico City: A raven-haired Miss Japan, Riyo Mori, was crowned Miss Universe 2007 on Monday in a contest marked by protests, a banned dress and the withdrawal of one beauty queen on the ground the pageant degrades women.

Mori, 20, the 56th winner of the title, was given her $250,000 diamond-and-pearl crown by last year's winner, Zuleyka Rivera of Puerto Rico, watched by a live audience of 10,000 and some 600 million television viewers worldwide.

A lifelong ballet dancer from a village near Mount Fuji, Mori wore a striking black gown with coloured lapels for the final. Winning surpassed the ambition of her grandmother, who told her as a child she wanted her to be Miss Japan one day.

"My mind went blank," she said of the winning moment.

Also finishing in the top five were second runner-up Ly Jonaitis of Venezuela and third runner-up Honey Lee of Korea.

Miss USA Rachel Smith, who slipped and fell to the floor during the evening gown competition and was jeered by the Mexican audience during the interview phase, was the contest's fourth runner-up.

Miss Sweden, Isabel Lestapier Winqvist, unexpectedly pulled out of the event because of complaints in her country that it degrades women. Sweden has won the Miss Universe crown three times in the past.

In another hitch, Miss Mexico was made to change her outfit for the regional dress contest after her original dress, decorated with brutal images of rebels in a 1920s religious uprising being hanged or shot, drew accusations of poor taste.

The annual Miss Universe pageant - which tries to present itself as something more meaningful than a swimwear parade - was first held in Long Beach, California, in 1952. The event was taken over in 1996 by US real estate mogul Donald Trump.

This was the fourth time the pageant was held in Mexico, which in 1991 won the crown with beauty queen Lupita Jones.

Mori - the second Japanese woman to win the Miss Universe title - will spend her year-long reign travelling the world to speak out on humanitarian issues like poverty and disease.

"She is an amazing champion, an amazing woman and I hear that they go totally insane in Japan, so that's good," said Donald Trump, who co-owns the pageant with NBC.