The Shanghai World Expo float measuring 16.8 meters long and 5.5 meters wide is being decorated at a workshop in suburban Los Angeles.

Hong Kong film star Jackie Chan and NBA star Yao Ming will probably appear on a Shanghai World Expo float in the upcoming Rose Parade new year celebration in Pasadena, California.

Chan's appearance has been confirmed but Yao's appearance depends on the fracture in his left foot, according to Chinanews.com. The duo are promotion ambassadors for World Expo 2010.

David Mark Winfield, an American former major league baseball player, and US Expo Commissioner General Jose Villarreal will also board the float.

The float measuring 16.8 meters long and 5.5 meters wide is being decorated with up to 100,000 flowers. Many overseas Chinese are busy at a workshop in suburban Los Angeles for the decoration.

A float from Shaanxi Province will also take part.

The 121th annual Rose Parade is scheduled to take place on January 1, featuring dozens of variously themed floats and spirited marching bands from across the United States and those representing foreign countries.

Since it was launched on New Year's Day in 1890 in Pasadena, about 20 kilometers east of Los Angeles, the Rose Parade has become an international event watched by millions of people.

A Beijing Olympics float appeared in last year's parade.