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Megan Fox looks more mini than ever on the upcoming action flick Jonah Hex.

The actress, 22, was all smiles as she rocked a sexy black corset, thigh-high boots and a cape on the Louisiana set late last week.

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Many would kill for her tiny frame, but she told E! at January's Golden Globes: "I am pretty sure I am a doppelganger for Alan Alda. I'm a tranny. I'm a man. I'm so painfully insecure."

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Asked about her diet secrets, she admitted, "I do have a 22-inch waist, I will say that."

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Her secret? "An immense amount of Pilates."