At Monday's hearing, Huffman admitted one count of mail fraud and honest services mail fraud.
There was no sign of her husband, William H. Macy, who's not charged in the scandal.
Huffman and Singer exchanged multiple emails on how to provide her daughter with "100 percent" extra time to take the SAT exam, an affidavit of the complaint claims, and arranged for her to take the test in a location controlled by an administrator who allegedly Singer bribed to protect the test and secretly correct her answers afterwards.
The girl scored 400 points higher than when she took the preliminary SAT a year earlier, prosecutors said. Her charges carried a sentence of up to 20 years in prison, but with the plea deal prosecutors have recommended a lighter sentence of 4-to-10-months.
They recommend that she spend 4 months in prison and pay a $20,000 fine. Felicity will be sentenced on September 13.
Felicity Huffman said "everything else (the prosecutor) said I did, I did".
"I am pleading guilty to the charge brought against me by the United States Attorney's office", the Desperate Housewives and American Crime actress said in that statement.
Seventeen other parents, including Loughlin, have chose to fight the charges and formally submitted not guilty pleas.
Huffman's daughter, Sophia Macy, was not charged.
According to court documents, Huffman paid Singer's Key Worldwide Foundation (KWF) $15,000.
The college admissions scheme was led by William "Rick" Singer, who pleaded guilty to four charges including racketeering conspiracy March 12. A further 17, including actress Lori Loughlin, have pleaded not guilty. Singer confessed to unlawfully helping children from numerous extremely affluent families cheat on standardized tests, also bribed a number of NCAA coaches to falsely designate the children as recruited athletes, thereby greatly lowering the minimum academic standard required for admission at prestigious schools such as Georgetown and Yale. Huffman paid Singer $15,000 to have a proctor correct her older daughter's SAT answers and considered going through with the plan for her younger daughter before deciding not to, authorities say. He admitted to paying $250,000 to get his son into the University of Southern California as a fake water polo recruit.
The star had previously released a statement taking responsibility for her actions and admitting guilt while showing at least some level of remorse, so it's possible a judge may acknowledge that as appropriately remorseful and lighten her sentence, especially after her guilty plea today.
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