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Video includes clips from E! and images from HarperCollins Publishers and Getty Images. Music provided courtesy of APM Music.
Caitlyn Jenner -- formerly known as Bruce -- only let the world know she wanted to be Caitlyn last year, but she may have been hiding that desire for decades.
Jenner reportedly told her second ex-wife, Linda Thompson, in the 1980s, "I am a woman trapped in a man's body."
That's according to Thompson's new memoir "A Little Thing Called Life," of which People published an excerpt.
"As we tried to work through our feelings," Thompson wrote in her memoir, "Bruce told me he was considering traveling out of the country, possibly to Denmark, to try to have the gender reassignment surgery anonymously and then come back as a female."