When it comes to public events, we can always count on seeing famous stars step out with toned bodies and glowing skin. But if you've ever been curious to know just how they achieved those looks, it's all because of their well-known celebrity diets.

Now, before you start raising your eyebrows, we're not talking famous fad diets that promise to help you lose weight in three days. We're talking about meal plans that actually worked for these stars — and you'll be glad to know that some occasionally treat themselves to cravings!

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A good example is country star Carrie Underwood. She's an "almost" vegan who eats mostly vegetables and eats cleanly.

"I'll never eat meat again, because I look and feel better without it, but if I could raise my own cows and chickens and produce my own eggs and cheese, it would be awesome! The food would taste better, because the animals would be happy," she said.

Check out the gallery below to see what kinds of diets your favorite celebrities have been following!