3:37 PM PT -- Cops are on the scene, and according to a neighbor it appears Aaron is fine. He was seen answering the door for the responding officers.
No word on whether he was under the influence, as the concerned caller claimed.
Cops are rushing to Aaron Carter's home after getting a report he appeared to be under the influence of something ... TMZ has learned.
According to law enforcement, cops just got a call from someone who had been on a call with Aaron when they felt something just wasn't right. Sources connected to Aaron tell us one of his neighbors went to check on him, but no one responded when they knocked.