Gloria Tang Tsz-kei (simplified Chinese: 邓紫棋; traditional Chinese: 鄧紫棋; pinyin: Dèng Zǐqí; Jyutping: Dang6 Zi2 Kei4; born Shanghai, China, 16 August 1991) is a Hong Kong singer-songwriter. She is better known by her stage name G.E.M., an acronym for Get Everybody Moving. She made her music debut in 2008 with the self-titled EP G.E.M.. She has since become one of Hong Kong's best-selling musical artists, winning IFPI Hong Kong's Top Selling Female Artist award in 2012.
G.E.M. gained popularity in Greater China after her appearance on Hunan Television's programme I Am a Singer in 2014. Her fanbase also extends to the United States, Canada, Australia, and Southeast Asia; the same year, she won the Favorite Asian Act award at the 2014 Nickelodeon Kids' Choice Awards. In 2015, she ranked eleventh on Forbes' China Celebrity List.
In 2016, she concluded a two-year world tour titled X.X.X. Live, and was the only Asian artist featured in Forbes' 30 Under 30: Music shortlist.