"Baywatch" actress Alexandra Daddario had the scare of her life Saturday ... when an irate man with a loaded gun went to her home and went off screaming something about her.
LAPD cops rushed to the scene and found the guy standing outside Alexandra's house. They told him to leave but he refused.
As police detained him they searched the man's car and found a loaded handgun. He was arrested for possession of a concealed firearm.
It's unclear if Alexandra, who has also appeared in "Texas Chainsaw Massacre," "Percy Jackson & The Olympians," "The White Lotus" and "San Andreas," was home at the time. We also don't know if her fiancé, producer Andrew Form, was home. They got engaged in December.
Alexandra is active on social media, with more than 21 million IG followers, so she's high profile on various media platforms.
The man arrested is still in custody.