"I Just Can't Stop Loving You" is a popular ballad by singers Michael Jackson and Siedah Garrett. Written and composed by Jackson, it was originally intended to be a duet between Jackson and his woman of choice: either Barbra Streisand or Whitney Houston. Even Aretha Franklin and Agnetha Fältskog (Formally of ABBA.) were offered the song, but all four refused. However, songwriter and Quincy Jones protege Garrett, who had written Jackson's memorable "Man in the Mirror", volunteered to sing with Jackson thus giving Garrett her first hit since Dennis Edwards' 1984 hit, "Don't Look Any Further". Garrett is quoted in The Billboard Book of Number One Hits by Fred Bronson that she was unaware she would be singing the song - although she had received a tape of it - until the day of the recording session, when Jones told her to step up to the microphone and sing it with Jackson. The song became the first of five number-one Billboard Hot 100 singles from Jackson's Bad album. It also reached number one on the R&B and Adult Contemporary charts, Jackson's second number-one song on the AC chart (his first, coincidentally, had also been a duet: 1982's "The Girl Is Mine" with Paul McCartney). It was released without an accompanying music video.

Originally, the album version featured a spoken intro backed with a longer version of the opening music. This intro was mixed out on future releases of the album.