I Knew It Was You is an American documentary film released on 16 January 2009,directed by Richard Shepard and produced by Brett Ratner, Stacey Reiss and Richard Shepard and distributed by  HBO and Oscilloscope.
I Knew It Was You debuted at the 2009 Sundance Film Festival, and had its television premiere in Spain on June 9, 2009. The 2009 Sundance Film Festival was held during January 15, 2009 until January 25 in Park City, Utah. 
