Gemma Collins says she was forced to call police for help after a stalker sent an "abusive and menacing" letter to her.
The TV personality, 44, says she was left "terrified" by the correspondence and has increased security measures at her home.
An insider close to the star, who found fame on The Only Way Is Essex, said the letter writer described his hatred for Gemma and that he would track her down, The Sun reports.
The source said: "Gemma was left shaken and very scared for her safety after she received a threatening and abusive letter from a man expressing his extreme dislike for her and using menacing language.
"It was really nasty and made reference to tracking her down, so she called the police straight away.
"It was alarming that this man knew her home address, but she already upped security and has round-the-clock guard dogs and has cameras onsite.
"She is always incredibly friendly with all her fans and happy to stop for pictures and a chat so to have someone send such an unpleasant letter has really shocked her."
A police investigation is now under way and the source added that Gemma is thankful that the threat is being taken seriously.
The added: "She thought about what had happened to Holly Willoughby and her kidnap threat ordeal so didn't want to take any chances."
Earlier this month, Gemma revealed she had been battling pneumonia for three weeks. Her health battles comes after she lost three stone, going from a size 26 to a size 20, in three months thanks to weight loss jabs.
In April, the TV star revealed she was using the NHS-approved Mounjaro injections since January.
While thrilled with her slimmed down frame, Collins admitted she was concerned that the medication could be responsible for her “looking older” as she highlighted her “next level” crow's feet.
At the time, she said: ““I really don't know what's happened to me, I really don't, It's just come on me overnight. But it has been a year since I've had any little tweakments,” she said.
“I don't know if it's since I've been losing weight. I sure haven't got ‘Ozempic face’ yet, but it would be the dream right now.”
“Ozempic-face” is a term used to describe a gaunt appearance usually caused by rapid weight loss.
