The 56-year-old is one of 50 wealthy parents who were exposed in the university admissions scandal last month.
“I am in full acceptance of my guilt, and with deep regret and shame over what I have done," she said in a statement, after she and her husband met with Rick Singer at their Los Angeles home to discuss rigging their daughter's exams scores to gain entry into an Ivy League university.
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As for her husband, actor William H. Macy, he hasn't been charged, and police have not revealed why.
"My daughter knew absolutely nothing about my actions, and in my misguided and profoundly wrong way, I have betrayed her," she added.
As part of a plea deal, prosecutors agreed to recommend a prison term at the "low end" of the four to 10 months Ms Huffman faces under federal sentencing guidelines.