Isabella Castillo Díaz (born 23 December 1994), best known by her stage name Isabella Castillo, is a singer and actress born in Havana, Cuba. Her best known role is that of Graciela "Grachi" Alonso, main character of the Nickelodeon Latin America's series Grachi. Castillo has released several songs from the soundtrack of Grachi, sung alongside other members of the cast such as Sol Rodríguez, Kimberly Dos Ramos, Andrés Mercado, Maria Gabriela de Faria, Lance Dos Ramos and Willy Martin.