The 'Keeping Up with the Kardashians' star vented her frustration in a series of messages posted on Twitter, reported Digital Spy.
"I wouldn't let the paps get a pic of me today and they threatened my life and said if I continue to block shots then they will make my world dangerous to live in! How dare they threaten my life and my unborn child! This has gotten way out of control.
"Yesterday 4 cars boxed me in. One in front, behind, and one on each side just to have me drive at their speed so they can snap through the window. Its really so scary what they are legally allowed to get away with," she said.
"Let me enjoy this last month of pregnancy please without threats and being scared to leave my home due to what dangerous thing they just threatened to do to me... What will it take for there to be laws put in place to prevent this behaviour?"
The star went on to insist that starring in a reality show does not give the press a legitimate reason to pry into her private life.