i’ve seen her name floating around somewhere but i actually have no idea who she is
Since no one answered this: she's an American pop singer known for borrowing heavily from drag/camp culture. She really came into the spotlight in the last year, after she had a string of modest hits from her most recent album. So I think there's a lot of interest in what comes next, since it's not just one song that did relatively well, but several.
Personally, I think she has some fun songs, but she's kind of terrible at this celebrity thing, in that she wants to be the artist Chappell Roan, but then she regularly addresses topics (in a pretty clunky way, tbh, she really needs media training) as Kayleigh, the real person. So it's become kind of this whole thing that people are watching her, in real time, fumble through figuring out how to be a celebrity. So the end result is that she both has very critical antis, and related, very defensive fans.
Anyway, I like this song by her: