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"I worked out very hard for this," Heidi told Access on the red carpet as husband Spencer Pratt looked on clutching a copy of the men's magazine.
"I worked by butt off," she continued. "So if you want to see how I got my Playboy body, you can go to [my Web site]."
"See her powerful curves," Spencer said. "They are powerful!"
Spencer told Access he's overjoyed to see his wife grace the pages of the magazine.
"It's an honor," he said. "I feel like I did something great, like I should get a trophy!"
He might not be getting a trophy for Heidi's Playboy shoot, but it is an early birthday present of sorts.
"It comes out on [Spencer's] birthday," Heidi told Access, "August 14. Happy birthday hubby!"
Heidi also explained that her shoot is a more than just a bunch of sexy photos.
"[Playboy] kind of had a vision… and we brought in Matthew Rolston, who is a very well known amazing photographer," she explained. "So, it's more art."
"Beautiful art," Spencer added. "Not like Picasso art, real beautiful art, you know what I'm saying?"
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PLAY IT NOW: Heidi Montag's Playboy Cover Is 'Beautiful Art'
PLAY IT NOW: Heidi Pratt Talks Playboy & 'The Hills'