TMZ Live

The woman who called the cops on Chris Brown says the singer pulled a gun on her because she was admiring a piece of jewelry ... and afterwards his people demanded she signed a non-disclosure agreement.

Baylee Curran appeared on "TMZ Live" and said she had partied with Chris in the past and he was always nice, but this time he appeared to be out of it ... on drugs or alcohol.

She says she came to his house with a friend, spent a little time in the hot tub, and then walked back inside where a member of Chris' crew was displaying jewelry. Baylee says when she admired one piece the guy went nuts, and then Chris followed suit by demanding she "get the f*** out" and pointed a gun at her.

The craziest part ... as she tried to leave she says Chris' people wouldn't let her take her cell phone until she signed a non-disclosure agreement. She refused to sign, and she and her friend left.

TMZ broke the story ... Baylee, Miss California Regional 2016, called 911 and that started the standoff with Chris.

You can see the full interview on "TMZ Live."