i know u have the video on it but she did it because slut face did it wtf ...wth Laurence Fishburne’s 19-year-old daughter is making a serious push to break into Hollywood — and she’s doing it with a hardcore sex tape. TMZ has learned Montana Fishburne is starring in a porno flick for Vivid Entertainment — explaining, “I’ve watched how successful Kim Kardashian became and I think a lot of it was…