The incident allegedly occurred at the Revel casino hotel in Atlantic City Friday, the newspaper reported Monday.
The troubled former star of "The Amanda Show" was wearing a platinum blond wig and sunglasses as she chased Bobby Cohen, 56, around the lobby of the casino, demanding he surrender his iPhone, the man's son said.
"She ran into the lobby alone looking totally frazzled with a load of shopping bags and a bag to carry a dog. She tried to get into the elevator, but then came out again, so my dad thought he'd try and take a picture," Cohen's 22-year-old son told the Post.
"Amanda saw him and lunged at Dad trying to grab the phone, saying, 'Sir, you can't take a picture of me; give me the phone.' She kept saying it over and over again until she was screaming" the son said.
"My dad tried to walk away slowly, but she started following him, chasing him around the lobby, saying, 'I need to see your phone now.' She wanted to grab his phone and delete the picture. Finally, security stepped in and we managed to get away from her.
"Amanda seemed pretty freaked out and flustered. What she didn't know was that Dad didn't even get a picture of her; he missed and took a picture of the floor."
The 27-year-old "What a Girl Wants" and "Hairspray" actress was last seen on the big screen in 2010's "Easy A." Her once-bright career has been eclipsed in recent months by reports of erratic behavior, legal woes, bizarre online rants and motor vehicle offenses.