We kid. But in an interview on the talk show airing today, the 29-year-old singer says that she only brushes her teeth three times a week!
"My teeth are so white and I don't like them to feel too slippery, but I do use Listerine and I do floss every day. But, I don't brush them every day," she tells DeGeneres.
So what does she use to tidy up her teeth between brushings?
"I'll use a shirt or something," admits the host of VH1's The Price of Beauty. "I know it's gross but I always have fresh breath. It's really weird, but I have great breath."
Simpson also takes the same low-key approach when it comes to her locks. "She only washes her hair about two to three times a month," her hairstylist BFF Ken Paves told Marie Claire. Or, as Simpson so eloquently told the magazine: "I'll wait until it smells."
Considering how gorgeous she looks, Simpson's grooming habits certainly don't stink.
In fact, maybe skipping the shower isn't such a bad idea -- one of our writers regularly goes a week without washing her hair!