PHOTOS: Oprah Winifrey Halts A Waiter From Adding Extra Serving To Her Food, Cos She's On A Diet

Oprah has always struggled to keep her weight in check.

And the media mogul was clearly watching her waistline at the Essence Black Women in Hollywood Awards luncheon on Thursday.

The 59-year-old stopped a waiter in his tracks as he tried to keep her sweet with an extra helping of salad dressing.

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