“I worked by butt off,” Heidi beamed. “So if you want to see how I got my Playboy body, you can go to [my Web site].”

On the other hand, Heidi hasn’t had the courage to break news of the photoshoot to her Bible-thumpin’ dad.

“I’m very religious. I’m a big Christian girl. I kinda wanted to keep those values a little bit. I haven’t told my dad yet. I might not tell him,” she tells Extra. “My mom was so excited she was just, like, pose! God gave you that body, you show off that cute little thing.”

Here… a little peek on what’s inside….

Heidi On Plastic Surgery: “I plan to get a few more upgrades…I’m sure as I get older I’ll need some touch-ups. I’m definitely not done with my surgical quest. I think I want to go bigger on my boobs for [Spencer]….Let’s do [another Playboy photo shoot] again when I get the upgrades.”

Heidi On Her Sex Life With Spencer: “I was never very sexual before I met Spencer…Before [Spencer], sex was just something that happened. Now it’s something I look forward to every minute of the day….I feel as if I’m just beginning to know my body with [Spencer]. [He’s] waking me up to what’s possible, and it makes me want to try every new thing, doing it all kinds of ways – indoors, outdoors, upside down.”