Byrne entered the adult film industry in 2004 at the age of 19. She arrived on the set of her first scene after answering an adult modeling ad in the newspaper, thinking that it was going to be for a lingeriephoto shoot instead of a pornographic film, but she decided to shoot the scene regardless. The scene was with Michael Stefano in Young Tight Latinas 6 for Red Light District Video and she was credited as Esmeralda in that film. She initially held two other jobs, one at Home Depot and the other one at Holiday Inn, in order to hide her porn career from her parents.
Byrne was initially supposed to portray Jennifer Lopez in the adult film parody J-Ho: Jenny on the Cock, but she was replaced by Renae Cruz following a dispute with the production company.