Heidi Montag revealed her “very tasteful” cover shot on the September 2009 issue of Playboy Magazine at the Los Angeles premiere of G.I. Joe: The Rise of Cobra on Thursday night.

Since when do they allow horses to pose for this magazine?

“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].”

“See her powerful curves,” Spencer said. “They are powerful!”

“It comes out on [Spencer’s] birthday,” Heidi revealed. “August 14. Happy birthday hubby!”