"I Do" is a song by Filipino singer Nina from her self-titled third studio album, Nina. It was released as the lead single of the album in August 2006 by Warner Music Philippines. The song was written by Joleen Belle, Michael Jay, Carsten Lindberg Hansen and Joachim Svare, and it was produced by Warner personnel Neil Gregorio. It is one of her few original singles. It is also her first upbeat pop-R&B-dance single, since her 2003 number one hit "Make You Mine". The song is described to be Mariah Carey-like, due to Nina's evident use of whistle register and upper-pitch trajectories in the last part of the song.

The song was panned by Original Pilipino Music (OPM) critics, although the album received critical acclaim from the same reviewers. Most reactions mentioned the unoriginality, describing how Nina almost completely sounded like Carey, with all the whistling vocal calisthenics. Same response was given to "Ooh Boy", which has the same uptempo arrangement to "I Do". The song was not as commercially successful as other Nina singles. It was released on digital download through iTunes and Amazon.com.

"I Do" was accompanied by a music video, directed by Treb Montreras II. The video features dance moves and non-basic choreography, making it the first Nina music video to feature such dance moves. The video is almost plotless. Throughout the video, Nina is seen coming out of a door wearing a violet dress. She dances to the chorus of the song, wearing red hooded jacket and jeans, and white sleeveless shirt and short black skirt with bling-blings, with back-up girls dancing behind her. By the end, Nina exits on the red door, where she entered in the beginning of the video.

...
Wikipedia