Mariah Carey allegedly had assistants spy on Nick Cannon to make sure he was not stepping out on the relationship despite his repeated insistence that cheating had nothing to do with their recent separation. Carey's spies followed Cannon during tapings of "America's Got Talent" in New York City, according to RadarOnline. Cannon hosts the NBC talent show.

"Nick’s phone would blow up from Mariah texting and calling, and he would turn it off. He was tremendously embarrassed by it," a source said. "Nick told friends that Mariah would get angry when he wouldn’t return calls, and sent assistants to see what he was doing."

Cannon quickly got fed up with the phone calls, the source claimed. “He was tired of having to answer to Mariah all the time. It was just sad to see, because Nick always used to brag about how amazing his wife was to everyone on the set,” the source said.

Cannon confirmed last month that he and Carey were estranged, six years after exchanging “I dos.” But it's unlikely he will be saying much more about their divorce after Carey reportedly had her lawyer give him a confidentiality agreement barring him from sharing details of their divorce. If he does, he will face “severe financial penalties,” TMZ reports.

“There is trouble in paradise,” Cannon told The Insider. “We have been living in separate houses for a few months.” The couple sold their 3-acre Bel Air property in July for $10 million after purchasing it together in 2009. “My main focus is my kids,” he added.

The couple have twins, a daughter, Monroe, named after the late actress Marilyn Monroe, and a son, Moroccan, named after the top tier of Carey's NYC apartment, the Moroccan Room. “I am not commenting on Mariah’s personal life, but Mariah is focusing on her children and her upcoming tour,” said a spokesperson for Carey.