EXCLUSIVE: Kim Kardashian 'Thought She Was Going to Die' During Paris Robbery, Cried and Begged for Her Life,

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Kim Kardashian West tearfully begged for her life while being robbed in Paris, France, on Sunday, a source close to the reality star tells ET.

The 35-year-old mother of two was held at gunpoint and tied up inside the luxury apartment she was staying at for Paris Fashion Week.

WATCH: Kanye West Rushes to Kim Kardashian’s Side as She Returns to New York After Robbery

“Kim is very, very shaken up,” the source says. “She thought she was going to die. They put a gun to her head while they were searching the apartment. She was crying, begging them for her life. It’s an absolute awful story. One of the most terrifying experiences of her life.”

“She is very upset and can’t stop thinking about what could have happened,” the source adds. “She is at home now with [husband] Kanye [West] and [their children] North and Saint. Friends have been popping in all day to visit her and be there for her.”

As for how the robbers managed to gain access into the apartment, the source reveals a staff member at the complex was forced to escort the intruders up to the Keeping Up With the Kardashians star's residence.

“The concierge walked them up into the apartment with a gun to his head,” says the source.

WATCH: Who Is Kim Kardashian’s Bodyguard and Where Was He at Time of Robbery?

The suspects reportedly left with an estimated $10 million worth of jewelry, including one ring worth $4 million, and a jewelry box with another $6 million worth of items.

Kim has since returned to New York City, where she was met by Kanye at the airport, and is “badly shaken,” according to her rep. She is expected to remain in NYC all this week.

See more on the shocking robbery in the video below.