Is it common to say like this "because you're a famoous celebrity"? I think "The reson why you're a famous.." would be better.
16)Just because you're a famoous celebrity doesn't mean you can't take the time to help people in need...
Okay, "the reason why" doesn't fit, but according to typical grammar, an adverb clause can't be a subject, you know. I think this is an out-of-grammar example.