Prieto was born in Montevideo, Uruguay and decided to move to Chile when she was 16 years old, she studied theater and has a daughter named Tabata, who was born when Prieto was 19 years old, Laura and Tabata's father separated shortly after the birth.
Prieto says she was thirteen when she began her career due to the support of her brother, who died that year.
She comes to television through El último pasajero as a model or flight attendant, later arrived at the TV show Calle 7 on January 12, 2009, where she continues in 2010.
Prieto participated in the Calle 7 record produced by Rigeo in which she would sing two songs, one of them with Maite Orsini.
It was recorded in Stockholm, Sweden and released by Via-X and TVN, during a stage of promotion of "Lady" in early November 2009.