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Supermodels aren't exactly known for clearing out an all-you-can-eat buffet -- but that hasn't stopped them from selling the one thing most people don't believe they ever consume: Actual food.

Following in the footsteps of slim sirens like Kate Upton, Padma Lakshmi, Paris Hilton and Audrina Patridge, Heidi Klum was just announced as the new face of Carl's Jr.

The slender 39-year-old unveiled her first promo photo for the fast food chain yesterday on her Twitter page, showing her (and her cleavage) sensually posing with a Jim Beam Bourbon Six Dollar Thickburger.

Mmmmm ... sounds delicious. And not exactly healthy.

While Heidi says she does "eat a lot of burgers" and also "a lot of fries," the calorie count for this one in particular may make it difficult to keep that runway-ready body. 

The Jim Beam burger, which is covered with bacon, pepper jack cheese and fried onions, has 920 calories. Throw in some medium fries (which Heidi says she loves so much) and the total meal comes to 1400 calories.

Of course, almost any diet allows a cheat day ... so maybe that's when Heidi made her ad.

Do you believe Klum actually chows down on Carl's Jr. in her real life?

Check out our gallery of Heidi eating stuff above -- she's been known to surprise us in the past!

Plus, see some behind-the-scenes video from her shoot below:

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