I'd never heard of Little Mix when I was asked to write a book about this girl group in 2014. Does that make me an out-of-touch old timer? I honestly don't think so. I'm pretty sure they're better known in the U.K. than the U.S.
Check it out, though. They got a write-up in The New Yorker not long ago! I have to say - I felt very in-the-know when I spotted it.