Master1234 It's hard to tell what POC ever are especially celebrities if you're going to use a red carpet image or a social media image. IMO she is not an NC50 but a lighter shade in MAC. Her MUA uses MUFE Y455 Praline or R520 on her. MAC counter matched me to aNC50 it was far from a perfect match and i looked weird but we had to use what was close (that was back in October of 2015) and in 2015 there was absolutely no foundation range whatsoever that covered POC.
To answer your question i was dark,now take the shade you currently know as NC50 and use that. I have been on this journey since Fall 2015 and that is along time.