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Images which allegedly showed Munn in various states of undress appeared on the internet earlier this month, though the actress appeared to deny that they were real.
Munn has now joked about the images in a letter read out in her absence at the SXSW screening of her movie The Babymakers, The Huffington Post says.
"Oh, and one last thing," she said. "Some of those pictures weren't even me. I mean, you can't even see my penis... and it's pretty big for an Asian. Sheesh."
Earlier this year, Munn posed nude for a campaign for PETA.
She is currently filming scenes for HBO's upcoming show The Newsroom, which is being made by The Social Network's Aaron Sorkin.
