Tevin Campbell

Usher is happily accepting the "King of R&B" title, and while Tevin Campbell doesn't disagree with that high honor, he does think there's someone who could challenge ... if he weren't in prison. We caught Tevin at LAX ... fresh off his jaw-dropping cameo during Usher's Las Vegas residency,…

Tevin Campbell could score a spot on "The Voice" with the amazing talent search he pulled off at LAX -- running into a guy who sings a Tevin classic better than he does. That was Tevin's assessment, anyway ... when we bumped into him and a nearby Delta employee who's been waiting for his big…