Similarly, Astrud Gilberto was a novice when she recorded the song. I guess you could say she lacked voice control, too, but it fit so well with the song. I think they waited until the last minute to tell her that there was a song they wanted her to record at the studio.
Yes, she was the wife of Joao Gilberto, a singer who recorded with Jobim (a fabulous songwriter). They wanted a version in English, and Joao's wife, Astrud, had the best English. (As it happens, I believe she also had perfect or close to perfect pitch). Her voice inflection -- or lack of it -- was so extremely cool and impersonal, like a model on a runway, that kind of in your face "I'm gorgeous." You couldn't see her, but her voice sounds like you'd imagine coming from all those beautiful girls in the mirror pic above! {^)