Girls wearing headdresses participate in the Pu'er Tea Festival in Pu'er, southwest China's Yunnan Province, April 27, 2011. The 11th China Pu'er Tea Festival opened Wednesday in Pu'er, Yunnan. Girls of 14 ethnic groups dressed up with their costumes and colourful headdresses became the highlight of the festival. [Xinhua/Yang Zongyou]