Knight has previously described the song as the highlight of her career as a lyricist, and is dedicated to two of her friends - "Melissa and Karen", according to the album sleeve.
The song was released in November 1998 but it failed to chart in Britain.
The music video for the original release of "Sista Sista" sees Knight performing alone, with a microphone in front of a red curtain.
The release was designed to capitalise on Knight's success at the 1999 MOBO Awards, where she won two awards for Best R&B Act and Best Album for Prodigal Sista.
The second video for "Sista Sista" sees Knight performing the song in a smokey bar, with her band.