Bella and Olivia Jade, the daughters of Lori Loughlin and her husband Mossimo Giannulli, will be called to testify before a judge if their parents do not change their "not guilty' pleas.

"Lori has been told by the legal team that the United States Attorney's Office will use her daughters as star witnesses in hopes of securing a conviction," a source told Us Weekly, adding that the girls have already "had their world turned upside down when their parents were indicted."

"She was told there wasn't unless there was a change from not guilty to guilty," the source continued. "Accepting a plea bargain would be the only solution."

Loughlin and her husband are accused of paying $500,000 to an admissions consultant to help her daughters get into USC. Unlike fellow actress Felicity Huffman who pleaded guilty, Loughlin is fighting the charges. If found guilty, Loughlin faces up to 45 years in prison.