Huffman's bond was set at $250,000 and she was released, though she was told to stay in the U.S. At the courthouse, Huffman's husband, William H. Macy, sat in the front row and ignored reporters' shouted questions outside.
It's the largest college admissions scam ever prosecuted by the Department of Justice, officials said.
Loughlin, Giannulli, and Hodge are among 50 people charged with taking part in the largest such scandal in US history, which prosecutors said steered graduating high school students into elite universities, including Yale, Georgetown, and Stanford by cheating the admissions process.
In a statement, USC said it is aware of the federal investigation and that the college is "conducting an worldwide investigation and will take employment actions as appropriate".
Two college students have filed a lawsuit against the University of Southern California, Yale University and other colleges where prosecutors say parents paid bribes to ensure their children's admission.
Announcing the indictments Tuesday - the result of an investigation dubbed Operation Varsity Blues - Andrew Lelling, U.S. attorney for the District of MA, said the parents charged represent "a catalog of wealth and privilege". Prosecutors in the USA attorney's office in Boston say his company, Edge College & Career Network, amassed $25 million through the fraud.
Singer arranged for a third-party - usually Mark Riddell - to take the test secretly in the students' place or replace their responses with his own.
Loughlin, who flew home from Canada, where she was shooting the Hallmark Channel series "When Calls the Heart", is one of several big names accused in the shocking bribery scheme.
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In his press conference , Garneau called this a precautionary move that is based on all the evidence available. Canadian authorities received the information from "an organization", he said , declining to say which.
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The couple allegedly "agreed to pay bribes totaling $500,000 in exchange for having their two daughters designated as recruits to the USC crew team - despite the fact that they did not participate in crew - thereby facilitating their admission to USC", according to the court documents. "I think I'm in complete denial, I really am, because when I think about it too much it will make me cry".
Ironically, Singer - who allegedly said his goal was to "help the wealthiest families in the USA get their kids into school" - claimed the KWF nonprofit was aimed at helping poorer students. At the meeting, the subcommittee approved her conditional admission to the university.
And while Olivia Jade said she loves school, she admitted that it was her parents who pushed her into pursuing higher education at the University of Southern California, where she is a freshman, despite her booming social media career.
It was unclear how many children benefited from the scheme, though investigators said more parents and coaches may yet be charged.
Loughlin and Giannulli were charged on Tuesday, as well as more than 40 other people.
While the allegations carry legal implications for Loughlin and Giannulli, their daughters' attendance at USC is also in jeopardy. "I'm going to a really nice school", Jade explained.
It's also not clear whether any of the students in this scandal will face charges.