Megan Fox Is A Closet Nerd!

Megan Fox (Mark Sullivan/WireImage)

Outspoken Megan Fox has a dirty secret — she’s a huge nerd!

It turns out that the Angelina Jolie look-alike who said, “Sex is something that everyone does, so why can’t I talk about it?” would rather watch a zombie movie than pose in a bikini, says her How to Lose Friends & Alienate People co-star Simon Pegg.

“Megan’s a bit of a geek, and she was a fan of Shaun of the Dead,” Shaun actor Simon, 38, told OK! at the Oct. 1 launch of the movie’s companion book.

In the movie Simon and Megan, 22, play a journalist and a starlet, both trying to make it to the top in New York -- while Simon's character tries to make it with her.

But offscreen their relationship was less X-rated and more X-Men.

“We talked about comic books,” admits Simon.

How to Lose Friends opened in movie theaters on Oct. 3.