"Did It Again" is a song recorded by Colombian singer-songwriter Shakira for her eighth studio album, She Wolf (2009). It was released on 16 October 2009, by Epic Records, as the second single from the album. The song was written and produced by Shakira, with additional songwriting and production from Pharrell Williams and The Neptunes, respectively. There is an alternate version featuring vocals from American recording artist Kid Cudi, while its Spanish-language version "Lo Hecho Está Hecho" (English: "What Is Done Is Done") includes additional lyrical contributions from Uruguayan musician Jorge Drexler. "Did It Again" is an electropop song with elements of samba. Lyrically, it details Shakira's involvement in a man's extramarital affair, which leads to her feeling guilty and hurt about it.

Upon its release, "Did It Again" was well received by music critics, many of whom complimented its lyrical content. Commercially, the song attained moderate success. It peaked within the top twenty in nations including Spain, where it was certified gold, and Italy. In the United States, "Did It Again" peaked at number one on the US Billboard Hot Dance Club Songs chart and Latin Pop Airplay chart, and at numbers six and 11 on the US Billboard Hot Latin Songs chart and Tropical Songs chart, respectively. An accompanying music video for "Did It Again" was directed by Sophie Muller, and features Shakira fighting a man in a bedroom. It generated a favorable response from critics and was complimented for its dance scenes. For additional promotion, Shakira performed "Did It Again" on a number of television shows.

After the release of "She Wolf", "Did It Again" was serviced as the next single from the album She Wolf, (2009), and is the second single overall. "Did It Again" was written by Shakira and Pharrell Williams, and is one of the four tracks on the album Shakira co-produced with The Neptunes, the others being "Long Time", "Why Wait", and "Good Stuff". About her collaboration with Williams, Shakira commented, "he comes up with ideas, and he executes them immediately. It's really cool, because I'm a little bit slower, and he's the man with the big strokes, and he really comes with great ideas. It was a great synergy". A Spanish version of the song, titled "Lo Hecho Está Hecho" was also released and features additional songwriting by Jorge Drexler. Musically, "Did It Again" is a midtempo electropop song that contains elements of samba. The lyrics of the song are confessional in nature and express Shakira's growing guilt over the fact that she is in a sexual affair with a married man, and her inability to end it, hence the title "Did It Again".

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