For Heidi Montag, her killer body didn't come easy. It required hitting the plastic surgeon's office gym with trainer Chad Waterbury regularly for months.

To get in shape for her airbrushed Playboy photos and her "live performance" at Sunday's Miss Universe competition, Heidi worked hard to look her best.

Fortunately, you can't gain singing talent like you can muscle tone.

Heidi's rendition of "Body Language" at the Miss Universe pageant was beyond bad, but the title of her crappy single is somewhat appropriate, given the time she spent getting into shape to pose for her weak set of PG-13 pics in Playboy.

"I definitely got in great shape for that, it's the perfect title considering everything!" she says. "In Playboy, you see the photos, but in Miss Universe, you see it live ... what my body looks like and what I've been working for."

Like a knockoff version of Britney Spears circa 2000, in other words.

WHAT DUMBBELL: Heidi Montag's workout (and airbrushing) works wonders.

Heidi and Spencer Pratt brag that their trainer "only trains professional athletes."

They should fit right in then, if being professional attention whores qualifies.

Her number one goal from the workout: to build a better behind. "I had just the flattest butt!" Heidi admits. "I wanted it to be pure muscle and be curvier. Playboy is very feminine, sexy, curvy and I really wanted to go for that look."

Follow the link if you actually want to read about Heidi's crappy workout. We can't imagine you do, but we just can't take this anymore right now.