"What a Girl Wants" was the second single from the album. Instead of the slower version, Aguilera insisted that a more upbeat mix, with an R&B edge, needed to be created to be released as a single. Released on October 29, 1999 to radio stations, the song received positive reviews from critics, with most praising her vocals in the track, comparing to those of Mariah Carey and Whitney Houston. "What a Girl Wants" peaked at number one on the "Billboard" Hot 100 on January 15, 2000 for two weeks, ending the chart reign of Santana's "Smooth" and becoming Aguilera's second number-one single. The single also topped the New Zealand and Spanish charts, while also peaking at number three in the UK, at number five in Australia and reached the top-twenty in most countries it charted. The song was nominated for Best Female Pop Vocal Performance at the 43rd Grammy Awards held on February 21, 2001. A Spanish version entitled "Una Mujer" was also made and included on "Mi Reflejo".