John Mayer reportedly has a "surprising side hustle" outside the music scene.

The singer-songwriter and guitarist -- full name John Clayton Mayer -- is reportedly a registered emergency medical technician (EMT), according to Deuxmoi.

Apparently, someone named John C. Mayer is registered in the National Registry of Emergency Medical Technicians with EMS ID 5788-4263-6831, and the registration will reportedly expire on March 31, 2026.

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(Photo : (Photo by Mike Coppola/Getty Images for SiriusXM)

Deuxmoi first talked about Mayer being an EMT on its Feb. 24, 2022 podcast episode. After it aired, several listeners and fans reportedly confirmed the report and claimed that the "Free Fallin'" singer was a registered EMT in Montana.

Before this, the musician stopped in the middle of his "Slow Dancing in a Burning Room" performance during his "Small Stage" concert in Los Angeles on Feb. 9 to help an audience member who had fainted.

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He asked to pause the music, stepped off the stage and checked if the distressed fan was conscious. When he returned to the stage, he updated the crowd and said that the woman was OK and safely escorted out in a wheelchair.

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Interestingly, Deuxmoi claimed recently that an exclusive source had told them that Mayer is currently "a student in a tactical casualty class."

"John Mayer was spotted in Beaverton, Oregon, going by the name John Miller. He's a student in a tactical casualty class. He's also wearing a $300,000 watch," the source claimed.

The source also reportedly mentioned that the expensive watch could be related to his EMT training.

John Mayer
John Mayer attends Variety's Hitmakers Brunch presented by Peacock | Girls5eva on December 04, 2021 in Downtown Los Angeles.
(Photo : Matt Winkelmeyer/Getty Images for Variety)

According to the National Association of Emergency Medical Technicians (NAEMT), its Tactical Emergency Casualty Care (TECC) course "teaches EMS practitioners and other prehospital providers how to respond to and care for patients in a civilian tactical environment."

The coverage of the course includes topics such as massive hemorrhage, airway, respiration, circulation, hypothermia (MARCH) assessment; surgical airway and hemorrhage control, wound treatment strategies and pediatric patient care, among many others.

Enstarz could not independently confirm the veracity of Deuxmoi's claims as of the moment.