Once upon a time, seeing a female celebrity without makeup was like spotting a unicorn.
It just didn't happen. And when it did, it was a complete accident and the star went into hiding until said event was no longer in the tabloids.
This was, of course, pre-Google Images and to a lesser degree, celebrity gossip sites.
Then Instagram came along and stars took matters into their own hands. Instead of having paparazzi leak pictures of them looking like regular people, they'd just share them for free.
Suddenly celebrities without makeup became a thing we celebrated, as Hollywood's hottest and most successful women decided to say "hey, we're just like you when we wake up."