Thriii (pronounced "three") is an American girl group that was formed in 2005 by the sisters China Anne McClain, Sierra McClain, and Lauryn McClain. The group was also known as 3mcclaingirls in 2005–2009, McClain Sisters in 2010–2014 and just McClain in 2014–2016.
All three sisters starred in the film Daddy's Little Girls (2007), for which they released the single "Daddy's Girl". They signed with Hollywood Records in 2011 and was the opening act for Big Time Rush on their Better with U Tour in Houston, but left the record label in 2013 without having an album released. In June 2020 the group returned with a new name, Thriii, and released their single "My Sanity".