The plea comes two months after she was arrested for her role in the college admission scandal law enforcement officials dubbed "Operation Varsity Blues", in which Huffman paid $15,000 to a phony charity in order to facilitate her daughter's cheating on the SATs.
After the exam, Riddell corrected her answers, giving her a score of 1420-an improvement of 400 points from her PSAT, which the affidavit said she took a year earlier, without Riddell. Prosecutors have said they will seek between four and 10 months in prison. She is among 14 parents who agreed to plead guilty to charges in the case. They are scheduled to be sentenced in September.
Felicity Huffman is ready to face the consequences for her actions.
"I had no knowledge of Mr. Singer paying Mr. Riddell", she said, "but everything else that Mr. Rosen said I did, I did".
Singer recorded a number of conversations in which he and wealthy parents discussed these schemes, including a conversation with Huffman.
Her husband, Fargo star William H Macy, was not with her in court. The money was disguised as a donation to Singer's charitable foundation, prosecutors said.
The parents are accused of paying an admissions consultant to bribe coaches in exchange for helping their children get into school as athletic recruits.
The college admissions scheme was led by William "Rick" Singer, who pleaded guilty to four charges including racketeering conspiracy March 12.
Macy has not been charged and prosecutors have not explained why. The couple also considered using Singer's services for their younger daughter, but ultimately opted not to, according to a criminal complaint.
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.
A California businessman has pleaded guilty to paying $250,000 in bribes to get his son into the University of Southern California as a fake water polo recruit.
She is one of several high-profile defendants in the case, who include actress Lori Loughlin and her husband, designer Mossimo Giannulli. The girls were admitted to USC as members of the crew team, though they did not participate in the sport.