NEW YORK (TheStreet) --  Weight Watchers (WTW) - Get Report stock is skyrocketing by 21.14% to $13.48 in afternoon trading on Tuesday, after investor and spokeswoman Oprah Winfrey posted a video to Twitter (TWTR) announcing she has lost 26 pounds while using the program.

Shares similarly rose in October after Winfrey said on The Ellen DeGeneres Show that she had lost 15 pounds, Bloomberg reports. 

The billionaire media mogul took a 10% stake in the beleaguered company last year, and has since increased the stake to nearly 15%.

She has joined the company's board of directors and agreed to be featured in advertisements.

Separately, TheStreet Ratings team rates the stock as a "sell" with a ratings score of D+.

Weight Watchers's weaknesses can be seen in multiple areas, such as its feeble growth in its earnings per share, weak operating cash flow and generally disappointing historical performance in the stock itself.

You can view the full analysis from the report here: WTW

TheStreet Ratings objectively rated this stock according to its "risk-adjusted" total return prospect over a 12-month investment horizon. Not based on the news in any given day, the rating may differ from Jim Cramer's view or that of this article's author.

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