Azizi:
I think that Hip-Hop/Rap influenced R&B more than Reggae did, but dancehall Reggae is definitely in the mix.

Mmm... perhaps we ought to define "R&B" here. The modern music defined by R&B is quite different from the original meaning of R&B - "Rhythm and Blues" - which was music largely created by black Americans - and which term was coined by Jerry Wexler. It then came to define music which incorporated blues as well as gospel and soul music - Stax in the 60s is typical of this. This particular period of American music had a big influence on Jamaican Ska... which led into Reggae.

Modern "R&B" is an entirely different musical style to the old R&B.