Crystal Liu (born An Feng; August 25, 1987), better known by her stage name Liu Yifei (Chinese: 刘亦菲; pinyin: Liú Yìfēi), is a Chinese-American[a] actress, singer, and model. She has appeared multiple times on Forbes' China Celebrity 100 list and was named one of the New Four Dan actresses of China in 2009. She is widely known as "Fairy Sister" in China.
In 2020, Yifei became known to international audiences for starring as the titular character in the Disney live-action film Mulan. The role earned her nominations for a Critics' Choice Super Award, a Kids' Choice Award and a Saturn Award.
Liu was born in Tongji Hospital in Wuhan, Hubei as An Feng (安风). She is an only child. Her father is An Shaokang (安少康), a 1st Secretary in the Chinese Embassy in France and a French language university professor from Beijing, and her mother is Liu Xiaoli (刘晓莉), a dancer and stage performer from Hubei. Her parents divorced when she was 10 years old, and she was raised solely by her mother. That same year, she adopted her mother's surname and changed her name to "Liu Ximeizi" (刘茜美子). Her godfather is Chen Jinfei (陈金飞), the Chairman of Beijing Tongchan Investment Group.

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