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Jeffrey Epstein's co-conspirator and ex-girlfriend Ghislaine Maxwell is cooperating with the feds following her arrest on child sex trafficking charges.

Maxwell is under heavy guard a day after she was arrested at her hideaway in New Hampshire.

Maxwell, 58, is accused of grooming underage girls and teenagers for sex with Epstein in his Upper East Side townhouse, New Mexico, Florida and London.

The British socialite reportedly received over $20 million from Epstein for her procurement services.

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Maxwell went into hiding in New Hampshire after Epstein, 66, took his own life in a Manhattan jail cell last year.

Epstein's former employer Steven Hoffenberg said Maxwell "knows everything" and will "totally co-operate".

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One of the people who should be very worried is England's Prince Andrew, who made numerous trips across the pond to visit Epstein's Manhattan townhouse and was a repeat guest on Epstein's private plane, dubbed the "Lolita Express."

"She's going to cooperate and be very important. Andrew is definitely, definitely concerned," Hoffenberg said.

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Others who are likely to be very concerned about what Maxwell tells the feds are super model Naomi Campbell (pictured), Tesla founder Elon Musk, media mogul Oprah Winfrey, and former President Bill Clinton.

Maxwell faces 35 years in prison if she doesn't cut a deal with the feds.