Lana Del Rey and Rihanna.

Apart from (some ) of my main faves, Britney comes to mind.

She seems genuinely nice and down to earth, I think the reason she finds those M&Gs so awkward is because those people are paying to meet and and she's uncomfortable being put on a pedestal.

Speaking from first hand experience, Lana.
Britney Spears and Kylie Minogue are definitely genuine and humble.

Nnnn people haven't actually said Katy?

I think gaga, Taylor and Lana. They all seem really nice to their fans and in interviews etc.

Robert Mitchum

Beyoncé EVERYONE who met her (all your faves) agreed

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Rihanna she's real and very grounded