Ehhh, in the end, from what we have seen throughout pop culture is that the music industry (the fans especially) tend to NOT like actors/actresses/sports stars that try to become singers/rappers.
Not rap but we all (sort of) remember these horrible attempts.
Don Johnson
Eddie Murphy
Bruce Willis
Rappers
Shaq
Deon Sanders
Kobe
AI
Rap, especially, is very much rooted in "where you came from". IceT and Ice Cube were "from the streets" FIRST and then got into acting, so they had their credibility, same with 50 Cent and Emenim.
There is a really good book on Pop Culture in the US that I use for a class I teach and we cover this topic. It is fun and interesting.