Girl You Know It's True is a 1989 album that served as the North American debut of German R&B duo Milli Vanilli. It is a reconfigured and repackaged version of the group's album All or Nothing for the North American market.

Milli Vanilli was a German R&B music act from Munich. The act was packaged by Boney M. founder Frank Farian in 1988 and consisted of Fab Morvan and Rob Pilatus as the lip-syncing performers, with the two actual main studio singers, Brad Howell, John Davis and studio singers, Charles Shaw, Jodie Rocco, and Linda Rocco, with an unrelated touring band. Their debut album, as All or Nothing in Europe, and expanded, including "Baby Don't Forget My Number" and "Blame It on the Rain", composed by Diane Warren, as Girl You Know It's True in the United States, achieved international success and brought them a Grammy Award for Best New Artist on 21 February 1990.