Quick search found this in an Irish Sun article:
Antonina Davydova is a beautician from Moscow, studying to be a pharmacist. She likes to write standup comedy in her spare time. Despite her newfound following, there are still Russians who are critical of her 'Big Tits Matter' meme, claiming that it "uses breasts for self-promotion".
It says she's originally from Ukraine, which doesn't surprise me. Just seems like that's a region of the world that's big-boob gifted.