30+ Celebs That Have Admitted to Questionable Hygiene Habits
Post Malone
Post Malone has long been the source of speculation that he's a smelly guy. However, there isn't a whole lot of concrete evidence to prove it's as bad as everyone says.

The rumor that his manager quit working with him due to the smell only helped fuel the fire. The singer has assured fans that the rumors of his smell have been greatly exaggerated but that he chooses not to "wear any deodorant or anything."
Jessica Simpson
No one was quite ready when Jessica Simpson told Ellen Degeneres that she only brushes her teeth about three times a week. At least she flosses and uses mouthwash daily.

Degeneres pressed her as to why and Simpson answered, "Because my teeth are so white and I don't like them to feel too slippery." She said that she does wipe them down, though, with a t-shirt or cloth. Still, she insists that her breath stays fresh.