Oprah Winfrey Loses $24 Million in One Day ... Thanks, Weight Watchers!

Oprah Winfrey took a very unwanted bath after Weight Watchers stock took a huge hit.

WW shares dropped a whopping 20 percent when the company reported a 21 percent drop in fourth-quarter net revenue -- which means O's bank account is about 24 million bucks lighter today.

Cry not for Oprah -- she's still reportedly cleared nearly $75 million since buying a 10-percent stake in the company and joining its board. The stock doubled the day her deal was announced ... but it's looking more like your typical yo-yo dieter now.