"We Didn't Know" is a mid-tempo duet by American recording artists Whitney Houston and Stevie Wonder, and was released as the sixth and final single from Houston's third album I'm Your Baby Tonight (1990). The single was released on April 14, 1992 by Arista Records. Wonder wrote and produced the song. The single peaked at number 20 on Billboard's R&B Singles chart. There was no music video made for the song. This is the first and only single from the album that was issued without a music video.