'Wonder Years' star Danica McKellar poses in sexy lingerie for Maxim

Winnie, is that you? First, you announce that you’re pregnant and then you pose practically naked for Maxim?

What happened?

Danica McKeller, who famously played the innocent Winnie Cooper on “The Wonder Years” is taking it (almost) all off for Maxim’s June issue.

She says of the shoot, “It was fun. We went with a collegiate theme with some knee socks which are always fun.”

McKeller used to be every young boy’s fantasy and with these new pics, she will surely be back there once again. But despite the racy photos, the soon-to-be mom says she’s always been the wholesome girl that men adore.

SLIDESHOW: Then/Now - The Cast of 'The Wonder Years'

"I've always been really cautious about guys who have a Winnie Cooper fantasy, and I'm so glad about that," she told the magazine. "I mean, I can count on one hand the guys I've been with. It was really challenging, but I never gave it up too soon, if you know what I mean."

The actress-turned-mathematician is about to release her third book, “Hot X: Algebra Exposed” in August. She explains to the magazine, that her books are intended “to help girls who [believe] that stigma that math is only for guys or you have to be a nerd to like math.”

Instead, she says, “Let’s make math fun and sexy and glamorous. Smart is sexy, that’s one of my main messages."

The actress, who has been married for a little over a year finds guys with good math skills sexy. “It’s really cool when a guy tips 20 percent quickly and effortlessly so that when the check comes, he opens it and signs his name and done,” she says.

Still struggling with those percentages? Let Winnie give you some help:

“Here’s how you do it. You look at the total of the check and you move the decimal point over one spot [to the left] so now it’s a smaller amount and then you double what you see and that’s your 20%.”

Here's some more math:

Winnie Cooper + lingerie = every boy's fantasy