“Real Housewives of Beverly Hills” star Erika Jayne conspired with a Secret Service agent who once reportedly had ties to Hunter Biden — to pursue bogus credit card fraud charges against her former costume designer, according to a bombshell $18 million lawsuit.

Christopher Psaila accused Jayne, 52, of filing fraudulent refund requests with American Express and, through her hubby, Tom Girardi, bribing Secret Service Agent Robert Savage III to “weaponize” the agency and unjustly prosecute the designer over legitimate charges he billed her in 2015 and 2016, according to the lawsuit filed Tuesday in U.S. District Court for Central California.

Text messages labeled as being from Robert Savage III were reportedly found on the first son’s abandoned laptop. 

Savage’s lawyer has insisted to The Post that “my client has never met or communicated with Hunter Biden.”

Psaila said he billed Jayne over $900,0000 for clothing and other services as she pursued a singing career from 2014-16.

The cash-strapped Girardis then allegedly conspired with Savage and other agents to pursue the false criminal claims so they could recoup their dough, the lawsuit alleges.

Disbarred lawyer Girardi, 83, — who is reportedly battling Alzheimer’s Disease and facing federal criminal charges in Chicago and Los Angeles for allegedly stealing client funds — was personal friends with Savage and promised him $100,000 “at the time the Secret Service commenced the investigation,” according to court documents.

Jayne and Psaila’s relationship went south in December 2016 when she accused him of overcharging her.

Around that same time, Tom Girardi, who is not named as a defendant, bribed Savage by representing him in a civil lawsuit against Volkswagen over defective minivan brakes — and paying him $7,500 to cover his damages, according to court papers.

Secret Service agents hooked up Jayne with a “secret recorder” to a meeting with Psaila that same month in which they reviewed their payment history, court documents read. Psaila admitted no wrongdoing in the recording.

“Erika [Jayne] used the Secret Service and AMEX to enact an illicit private collection scheme to extort money from Plaintiff Chris Psaila,” the suit reads.

Psaila was charged with federal charges of wire fraud and aggravated identity theft in 2017, but the case was dismissed in 2021.

A spokesman for the U.S. attorney’s office in Los Angeles, told the Los Angeles Times in February that the case was dropped due to “law enforcement evidence preservation issues.”

Though nothing came of the charges, Psaila said in court papers the probe destroyed his business, prevented him and his husband from adopting a child and interfered with his ability to care for his father, who was dying of pancreatic cancer.

“Independent federal prosecutors at the U.S. Attorney’s Office made the decision to charge plaintiff with crimes, no one else,” Evan Borges, an attorney for Jayne told NBC News.

“The notion that Erika controlled the U.S. Government, or for that matter a Fortune 100 company such as American Express, is fantasy.”

With Post Wires