Bobbi Kristina Brown‘s husband Nick Gordon and a friend found her in the tub … according to police in Roswell, GA. We’re told her husband and friend immediately started CPR on her … until police and paramedics arrived.

We’re told police took over life-saving measures on the scene — and then she was taken by ambulance to a hospital.

Doctors have now stabilized her breathing.

Still unclear why Bobbi fell unconscious. We’re told a friend made the call to 911 from Bobbi’s house.

The circumstances are especially eerie — Whitney died in a bathtub at the Beverly Hilton on February 11 … three years ago.

Update: According to TMZ, Brown is in the ICU of North Fulton Hospital, and doctors have stabilized her breathing. Sources close to the family told TMZ Bobbi Kristina has been placed in a medically induced coma for swelling of the brain.