"Qué Hiciste" (English: What Have You Done) is a song recorded by American singer Jennifer Lopez for her fifth studio album, Como Ama una Mujer (2007).

It was written and produced by Marc Anthony and Julio Reyes Copello, with additional writing from Jimena Romero.

"Qué Hiciste" became a commercial success for Lopez, appearing in a wide range of charts around the world.

[2] The song marked the beginning of a musical project that lasted for three years[3] and was originally conceived from a dream that Anthony had with Spanish recording artist Rocío Jurado two weeks after the singer's death.

"[5][6] Lopez revealed that as Anthony did not want to forget the lyrics, and without any studio equipment nearby, she grabbed her phone, called up her answering machine and asked her husband to sing the melody.

"[6] James Reed of The Boston Globe noted the song to be a "diva-mode kiss-off" of a lover who "unraveled her happy home", noting the lyrics: "Se te olvidó que era el amor lo que importaba/ Y con tus manos derrumbaste nuestra casa" ("You forgot that it was love that mattered/ And with your hands you tore down our home").

[8] Tijana Ilich of About.com gave a positive review of the song, stating that if the rest of Como Ama una Mujer is as good as "Qué Hiciste", "it's going to mean another big hit for Lopez".

[9] James Reed of The Boston Globe called "Qué Hiciste" a detour on "an otherwise lush, quiet album".

[7] Sal Cinquemani of Slant magazine expressed his disappointment in Como Ama una Mujer lacking a "Latin booty-shaker" song, citing "Qué Hiciste" as "the closest we get".

[21] The clip opens with Lopez driving an old car down a dusty highway in the middle of the desert, leaning out of the window singing.

The performance featured a heavy use of a smoke machine and was introduced with a montage of outtakes from Lopez's stint on the show the day prior.