A source tells ET that DiCaprio was in fact wearing a heart monitor for a "routine checkup," and is doing just fine.
WATCH: Leonardo DiCaprio's Steak Gets Seasoned by Salt Bae -- and the Internet Can't Handle It
On Friday, the Oscar winner was also photographed in Brooklyn while touring the garages for the inaugural Formula E New York City ePrix. DiCaprio did not appear to be wearing the medical device during this trip, though he was sporting a loose-fitting black collared shirt that would most likely have hidden the object. During his visit, DiCaprio met with Formula E CEO Alejandro Agag and learned about the racing circuit, the way the cars are built and how the races are organized.
WATCH: Leonardo DiCaprio Is the King of the World While Shirtless on the Beach
This isn't the first time we've seen DiCaprio out and about in New York City this summer.Read more at Entertainment Tonight