Taylor Swift has obtained a restraining order against a man who believes he is married to the star.
The 24-year-old singer filed legal documents which claim Timothy Sweet has been stalking her since 2011, sending dozens of emails, letters and social media posts, in which he declared his love for the 'I Knew You Were Trouble' hitmaker, according to TMZ.
Mr Sweet also vowed to "kill" anybody who stands between them, including America's Secretary of State, John Kerry, and claims he will carry a gun to protect Taylor.
Among a number of messages he sent to the star, Mr Sweet, 33, said: "If anyone in Taylor's family get killed it is not my fault.
"My wife Taylor Swift (Sweet) and I live in Beverley Hills. I am in love with her. In conclusion, we treat each other with dignity and respect. I will carry a gun to protect her the rest of my life. (sic)."
He went on: "Dearest Taylor, I'll kill any man who gets in the way of our marriage. Message to John Kerry, Secretary of State. Message from YOUR presidential candidate (sic)."
The singer filed the request for the temporary order, which will expire on March 25, at Los Angeles Superior Court, and a judge has ordered Mr Sweet to stay at least 100 yards away from Taylor, her mother Andrea, father Scott and younger brother, Austin.
Taylor stated that Mr Sweet's behaviour is "seriously alarming and harassing" and the constant messages and phone calls are "extremely distressing to me and my family", adding that she does "not have desire to interact with or communicate in any way with Mr Sweet."