Ain't It Funny is a song by American singer Jennifer Lopez from her second studio album, J.Lo (2001). Written by Lopez and Cory Rooney and produced by Rooney and Dan Shea, it was released as the album's third international single in mid-2001. There was a very successful remix to the song which reached number 1 on the Billboard Hot 100 in 2001 named Ain't It Funny (Murder Remix) .

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Other popular songs similar to "Aint It Funny" by Jennifer Lopez.