"I Do" is a song recorded by American recording artist Colbie Caillat. It was written by Caillat and Toby Gad, and produced by Greg Wells. The song was released as the first single from her third studio album All of You (2011). The song was released to iTunes and radios on February 7, 2011 through Universal Republic. Musically, the song is an upbeat "sunny-day" pop song, and the lyrics speak about taking relationships further, like marriage. "I Do" debuted at number 38 on the Billboard Adult Pop Songs chart. It later debuted at number 23 on the Billboard Hot 100. According to Nielsen Soundscan, it has sold about 154,000 copies in the US. The music video for "I Do" premiered on March 11, 2011.

"I Do" was released on February 7, 2011 as the lead single from her upcoming third studio album All of You. It was written by Caillat and Toby Gad, and produced by Greg Wells. The song is an upbeat folk pop song with acoustic influences, whose lyrics, according to Caillat, speak about marriage. Brian Voerding of AOL Radio noted that the background vocals are weaved across the auxiliary percussion beats, and Caillat sings the lines with brief pauses. John Hill of About.com wrote that "I Do" maintains the sound of Caillat's previous works, and includes an acoustic arrangement, with shuffling beats. He also commented that the song deals with the protagonist wanting to spend the rest of her life with the one she loves. The song also uses ukulele as an instrument, which Hill thought fitted "perfectly and adds an additional layer of fun to an already upbeat song."

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