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.