"Oops!...I Did It Again" is a song by American singer Britney Spears, from her second album of the same name. It was released on March 27, 2000, by JIVE Records as the lead single from the album. The song was written and produced by Max Martin and Rami Yacoub. "Oops!... I Did It Again" is a song that lyrically speaks of a female who views love as a game, and she decides to use that to her advantage by playing with her lover's emotions. Its bridge features a dialogue which references the blockbuster film Titanic (1997).

Upon its release, "Oops!... I Did It Again" received positive reviews from music critics, who noted similarities to her debut single "...Baby One More Time". It was nominated for the Grammy Award for Best Female Pop Vocal Performance during the 2001 ceremony. Commercially, the track peaked at number nine on the U.S. Billboard Hot 100. It went to the top of more than 15 countries, and remains one of the best-selling singles of all time, with over 4 million copies sold.

An accompanying music video was directed by Nigel Dick. It depicts Spears on Mars, where she addresses an astronaut who has fallen in love with her. She is dressed in a red catsuit. It went on to receive three nominations at the 2000 MTV Video Music Awards. Spears has performed the track during her Oops!... I Did It Again Tour, Dream Within a Dream Tour, The Onyx Hotel Tour and Britney: Piece of Me.

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