Buzolin was born in Campinas, São Paulo, Brazil on February 3, 1991. She is the youngest child of two. Her parents named her Mariah Buzolin Oliviera but sometimes she credited as Mariah Moore in several films. At the age of six, she moved to Chicago with her family, where in less than three months she was fluent in the language. In 2003, her first professional opportunities began to appear when she won a fashion contest, competing against hundreds of other girls nationwide. She moved to Los Angeles in 2006 after getting the attention from several agents and agencies. She began her acting career in 2007 when she playing Sara on Fallout and also playing Mary on The Faithful alongside Aliens in the Attic star, Austin Butler.