The song's music video was directed by Brett Ratner and filmed in Los Angeles, California.It serves as the sequel to the video for "It's like That", the first single released from The Emancipation of Mimi.Beginning with the "It's like That" video, the protagonist is at her bachelorette party, where one of the guests reveals himself as a former lover (played by Wentworth Miller). The video for "We Belong Together" begins the following morning, when the protagonist remembers her former boyfriend, as she is preparing for her wedding. As she marches down the aisle, the protagonist debates whether she belongs with her former boyfriend or her fiance (played by Eric Roberts).
Once she reaches the altar, she catches sight of her former lover who is watching the wedding from a distance. She runs from the ceremony and into his arms, shocking everyone at the wedding.The video is noted for the fact that Carey wore the same Vera Wang wedding dress that she wore at her wedding to Tommy Mottola in 1993. She said it's nothing deep but there was no way she was finding a Vera Wang wedding dress that fit her in two days.
The video reached number-one on several video-chart countdowns, including BET's 106 & Park, MTV's TRL (where it retired after it remained on the countdown for fifty days), MuchMusic's Countdown, and VH1's Top 20 Video Countdown. VH1 named the song #1 on its "Top 40 Videos Of 2005" in December of that year.By July 25, 2005 it was LAUNCHcast's most-watched video of the year, with 7.5 million streamed performances. The video was nominated for "Best R&B Video" and "Best Female Video" at the 2005 MTV Video Music Awards
