They all made their first appearances in a Boston federal court on Wednesday morning.
Huffman arrived at federal court just before noon Wednesday.
Loughlin appeared to be in good spirits at the court appearance, waving and saying hello to fans before she entered the court.
Loughlin, who played Aunt Becky on the sitcom Full House in the 1980s and the 1990s, and Giannulli are accused of paying $500,000 USA to have their two daughters labelled as recruits to the University of Southern California crew team, even though neither participated in the sport.
Prosecutors say the scheme was overseen by California college admissions consultant William "Rick" Singer, who has admitted to facilitating the cheating scam and bribing coaches to present the parents' children as fake athletic recruits. Huffman allegedly paid $15,000 so that her 18-year-old daughter, Sofia, could cheat on the SAT in order to help get into an elite college. Neither they nor their attorneys have publicly addressed the charges against them.
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On Wednesday, Loughlin smiled as she walked out of the courthouse and climbed into a black SUV with her lawyers.
Stanford, the University of Southern California, Georgetown University and other schools implicated in the scheme have said they are reviewing the admissions of students accused of participating.
The actress and her husband - who's also facing charges of conspiracy to commit mail fraud and honest services mail fraud - sat together, before facing the judge separately.
Loughlin and Giannulli's daughter, social media star Olivia Jade Giannulli, has also been dropped from advertising deals with cosmetics retailer Sephora and hair products company TRESemmé.
Loughlin and Huffman are facing anywhere between six to 21 months in prison if convicted or they plead guilty, the official added, though the exact sentence would depend on a combination of factors.
Regarding Huffman's involvement, she and husband William H. Macy allegedly "made a purported charitable contribution of $15,000.to participate in the college entrance exam cheating scheme on behalf of her eldest daughter".