Olivia Wilde and Bob Harper -- the trainer on NBC's "The Biggest Loser" --  just got named the Sexiest Vegetarian Celebrities of 2010 ... courtesy of the animal lovers over at PETA.

Of the honor, Wilde says she is "way happier when I eat a plant based diet, and I feel about a thousand times more energetic."

Harper adds, "I enjoy living a plant-based diet because it makes me feel clear headed and strong, not to mention my genetically high cholesterol dropped more than 100 points."

Last year's winners were Milo Ventimiglia and Kellie Pickler.

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