The incident happened about 1 a.m. July 3 in New York's Soho neighborhood, the New York Post reported.
Anna Graham, 54, wife of Russian sculptor Ernst Neizvestny, was watching a friend's unlocked car as they packed it to go on a vacation when two men approached her.
One of the men began ransacking the car and the other demanded Graham's wallet, she said.
"He asked me for my wallet and I said, 'Are you kidding me?'" Graham told the New York Daily News. "I was in my pajamas, for Christ's sake!
"That's when the gun went against my forehead," Graham said. "He said, 'I'll shoot you, [expletive]!' I said, 'No, you won't'
"He lowered it to my chest. The other one was right next to him saying, 'Shoot! Shoot! Shoot!'" Graham told the newspaper. "I said, 'It's not easy to shoot someone. You have to have [expletive] to do that. And you have none.'"
Eventually, Graham's two friends came out of the apartment. One of them jumped on the suspect in the car, who then kicked her to the ground, the New York Daily News said. The other called the police.
The muggers fled the scene, making off with an iPad mini, a Samsung Galaxy cellphone and about $600 in cash from the car, police said. They remain at large.