"Ain't It Funny" is a song recorded by American singer Jennifer Lopez. It was co-written by Lopez and Cory Rooney for the Adam Shankman-directed romantic comedy The Wedding Planner (2001). Shankman, however, felt that the song had too much of a Latin-influence to be featured in the film and it was instead included on Lopez's second studio album J.Lo (2001). "Ain't It Funny" was released as the third single from the album on June 20, 2001 by Epic Records. The single's music video, directed by Herb Ritts, was released around the same time.