Usher's got a serious problem shaking an obsessed fan ... and it's gotten so bad she was arrested standing outside a recording studio trying to film him.
Law enforcement tells TMZ Usher was at an Atlanta recording studio earlier this month when Darshelle Jones showed up. We're told Jones was across the street trying to record the singer with an iPad, a big no-no considering he's got a restraining order against her.
According to the arrest report -- obtained by TMZ -- Jones was only 100 feet away from the studio and the restraining order says she's gotta be at least 200 yards away from the singer.
Jones was booked for aggravated stalking and is still in custody.