“I Do” is an upbeat folk pop song with acoustic influences. The song was performed by Colbie Caillat, an American pop singer-songwriter and guitarist from Malibu, California. Colbie Caillat was nominated twice for Best Pop Collaboration, for her featured vocals on Mraz’s “Lucky” and her background vocals and writing on Taylor Swift’s “Breathe”, and was part of the group that won Album of the Year for her background vocals and writing on Swift’s Fearless. The song “I Do” was written by Caillat and Toby Gad, and produced by Greg Wells. The song was released as the first single from her upcoming third studio album All of You. “I Do” was released on February 7, 2011 as the lead single from her upcoming third studio album All of You. “I Do” debuted at number thirty-eight on the Billboard Hot Adult Pop Songs chart, the week dated February 12, 2011. It has reached a position of twenty-four on the same. The song later debuted at number twenty-three on the Billboard Hot 100. According to Nielsen Soundscan, “I Do” has sold about 154,000 copies in the US. It has also re-entered the Hot 100 at #97.