rihanna can do pop, dance pop, electro pop, hip-hop, r&b, ballads, dub step, pop rock, rock, reggae, dancehall, country, alternative, latin pop, rap..etc etc
country? latin pop? rap? (she doesn't rap) dance pop? just call it dance and leave the pop lol
hip-hop? it just don't count if you don't rap for real. she doesn't do rock either, just pop rock.
but she's definitely versatile when it comes to genres.
how is p!nk versatile she's been doing nothing but pop rock since 2001. The only album that was different was CTMH and that was because her label forced her to sing R&B. Hell even Britney is more versatile than P!nk
at Alicia winning when she has been using the same formula over more than a decade. 
