The book, which evoled from Twilight fan fiction and has been dubbed "mummy porn", has become the runaway hit of the year, topping best-seller lists around the world.
But those accolades aren't enough to convince Gomez to sign on to take part.
"I know I'm taking risks but I don't think I could do that. That would be a little too much for me," she revealed over the weekend.
Photo: Getty Images / Getty Images Entertainment / Jag Gundu
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