Willow Camille Reign Smith (born October 31, 2000), known professionally as Willow, is an American singer, actress, and dancer. She is the daughter of Will Smith and Jada Pinkett Smith, the younger sister of Jaden Smith and the half-sister of Willard Carroll "Trey" Smith III. Smith made her acting debut in the 2007 film I Am Legend and later appeared in Kit Kittredge: An American Girl alongside Abigail Breslin. She received a Young Artist Award for her performance.
In her 2015 album Ardipithecus, she performed the song Marceline which is based on the aforementioned character and the series three years prior to voicing the character Beth in the Adventure Time series finale "Come Along With Me." She also sang the theme song for that episode as Beth.