As a singer, she is best known as a member of the sister brother group Thriii with her sisters.
Sierra Aylina McClain was born on March 16, 1994, in Decatur, Georgia. Her father, Michael McClain, is a music producer who produced Solange Knowles' debut album Solo Star (2002). Her mother, Shontell, is a songwriter and former screenwriter. She has two younger sisters, Lauryn and China Anne, who are also actresses and singers, and has a younger brother, Gabriel.
After her sister was discovered in 2004 by a music executive who heard her sing, China was cast in the film The Gospel (2005) with Sierra cast in the children's choir. Around this time the sisters formed the music group the 3mcclaingirls. In December 2005, while on the set of Tyler Perry's House of Payne, China introduced her sisters Sierra and Lauryn to a show producer and the sisters performed a song for him. They were then cast in the film Daddy's Little Girls (2007) as the James sisters, and Sierra guest starred in the series, Tyler Perry's House of Payne. In 2008 the three sisters began posting videos on their YouTube channel of themselves singing covers of songs. McClain had a small role as a neighbor in the short film Six Blocks Wide (2008). The next year, she starred as Carina in the film Shrink alongside Kevin Spacey and Keke Palmer.

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