Baylee Curran, a guest at Chris Brown's Los Angeles home, told "GMA" Brown pointed a gun at her face after he became angry when she complimented another man's jewelry.
Brown's representatives did not immediately respond to ABC News's request for comment. His attorney called the allegations "demonstrably false" in a tweet sent out early Wednesday.
The 25-year-old model spoke to ABC News about the incident in Brown's home and the emotions she experienced as the events unfolded.
"I didn't want anything to escalate because, hello, he's holding a gun to me," Curran said.
According to Curran, it all started when someone brought over a box of expensive diamond jewelry.
"I was just standing over it admiring it. Not touching it...and then one of Chris's friends says back away from the diamond," Curran claimed. "That's when Chris came in and said 'I'm so sick of all of you people.' He took the gun out put it in my face and said 'get the F out.'"
When Brown allegedly pulled the gun on Curran, she says she was "terrified, absolutely terrified," adding, "I thought he was going to shoot me."
Curran's call to police prompted a response that led to a 14-hour standoff, the Associated Press reported. The situation ended when police obtained a search warrant to enter the residence and took Brown into custody.
During the standoff, Brown posted to social media, maintaining his innocence.
Police did not confirm any of the details surrounding the alleged altercation and described Brown as being "cooperative."
Brown was released on $250,000 bail at 11:19 p.m. local time, according to jail records. His next court date is set for Sept. 20.
Brown's attorney, Mark Geragos, tweeted early Wednesday morning that the musician had been released, and added, "The allegations against him are demonstrably false."
The Miss California Regional Pageant Organization also sent a statement to ABC News, making "clear Miss Curran is not a reigning title holder."
"Miss Curran has been dethroned as of July this year due to a breach of contract. Baylee Curran has been asked numerous times to return her crown/sash which she has refused to do," the organization said. "We do not condone the alleged actions of Mr. Brown or his associates, however, Miss Curran has incorrectly identified herself as Miss California Regional."
The pageant cited behavior "not befitting a queen," as to why she was dethroned.