Alien Sun (born Suen Kai-kwan on 11 September 1974), also known as Paulyn Sun and Pauline Suen, is a Hong Kong-based Singaporean actress. She represented Singapore at the Miss Universe 1994. She quit her job in business development to launch an acting career in Hong Kong.
In 1996 she was offered HK$20 million to pose nude and rejected the offer. She was the first female from Singapore to be nominated for a Hong Kong Film Award in 1997 for her role in Island of Greed.
In 2000, she was featured in Wong Kar-wai's award-winning film In The Mood For Love but most of her scenes were not put into the final cut. She has worked in many commercials for ATV and beauty products in an effort to further advance her career. She is lesser known than her acting peers in Hong Kong despite her efforts. She can fluently speak English, Cantonese, Mandarin and Japanese and has used all four languages in her roles.
Sun has said her nickname "Alien Sun" was given to her by classmates in school who made fun of her for having a head that was slightly disproportionately larger than her body during childhood.