The revamped "Real Housewives of Miami" got its first dose of real-world drama this week when 911 was called due to a medical emergency on set ... and TMZ's learned it was for a brand new cast member.
Sources close to production tell us ... Julia Lemigova began feeling ill late Thursday morning after filming on the roof of an incredible home in Montauk, NY ... where they were staying during a cast trip.
We're told it's likely Julia got too much sun and was overheated, so someone inside the home called 911 because production felt it was best she get checked out by professionals.
According to the East Hampton PD report ... an EMT was called to the scene around 11:30 AM for a person who was feeling weak and nauseated. They were administered an IV, but did not require a trip to the hospital.
Our sources say cameras were rolling for the incident, as the ladies were all brunching to celebrate Larsa Pippen's jewelry line.
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Julia -- a Russian former model who's married to tennis legend Martina Navratilova -- was not part of the original 'RHOM' cast when it aired on Bravo, but will be featured on the Peacock reboot later this year.
We're told after she recovered from her health episode, she carried on with the rest of the 'housewives' and kept filming the rest of the day and night.
Our sources say the women flew to New York Tuesday to film their Montauk excursion -- where they shacked up in an $8.5 million home with panoramic ocean views -- then headed back to Miami on Friday.