The niece of Argentinean pop duo Gloria y Noemi Gil; Las Hermanas Gil, Fey has been involved with the music industry since she was a child. Fey became well-known in Latin America with her debut album, Fey. It was her next album, however, Tierna La Noche which brought her to worldwide fame.

Fey has sold over a million records in her native Mexico (and many throughout the worldwide Latin community), most of them produced by José Ramón Florez. Fey's self-titled debut was released in America in 1995, followed one year later by Tierna La Noche.

Fey, despite being a Mexican native, spent almost her entire childhood in Spain. She spent 19 years there, from the ages of 3 to 22. As a result, her accent sounds more Spanish than Mexican, especially in her early albums. This most famously appeared in her first single, "Media Naranja", when she sang "toqué la luna gra-(TH)-ias a ti" *In northern spain the C has two sounds (k) and (th) with the stereotypical Castilian th sound. She has sold around 9.5 million copies around the world