Police received a call around 3:25 p.m. and arrested a suspect.
The suspect, 23-year-old James Edward Pearce, is facing charges of violating a restraining order to stay away from her.
In March, a judge granted Portman a permanent restraining order against an alleged stalker.
In that case, detectives say a man traveled from Colorado to try and meet Portman, claiming he had conversed with her several times telepathically.