The woman added: "Just thought you'd be amused to hear of your part in the drama. This Thanksgiving I'm grateful to you for exposing a cheat!"
The food critic was shocked by the revelation and says he hoped the message was fake.
"Please, please tell me this is a crank post. I'd hate to learn otherwise."
He the screenshot of the question on his Twitter account.
"So, this popped up on my live online food chat today. Cheaters, take heed!"
Sietsema says he was unsure what restaurant review of his the woman found the photo in.
No one has yet come forward to identify themselves as the woman or the cheating husband, the Daily Mail reports.