I didn't notice TayTay had a boob job.
Iggy's surgery was disastrous. Her new face is kinda weird, tbh. Depending on the angle it looks flawless, but mostly, it looks weird.
Lana only had her lips done I think, but her whole face looks kinda worked on, I don't know.
Britney's only confirmed surgeries are only lip injections and a possible eye lift. The nose thing had never been confirmed, though her nose looked considerably bigger in 1998/99 pics, she was also chubbier by then and facial structures tend to change a lot with more or less body fat.
Per see, there isn't really anything: