Genevieve Sabourin started her loud commentary from the minute court started, and even her lawyer, Todd Spodek, told her to stop talking.
Finally, the judge had enough, saying it was impossible to proceed with the trial, ordering her to spend 30 days in jail.
She was able to settle down and testify about a dinner that she says shaped up like a dream date. Sabourin said Baldwin picked her up at the posh hotel where he'd helped her secure a room, had a hired car drive them slowly through Central Park and then surprised her with tickets to a Broadway show on a February Friday in 2010.
"I was very charmed ... I'm having a fantastic date on Valentine's (Day weekend) with a guy who is single," Sabourin said.
The "30 Rock" star said he had dinner with Sabourin to give her acting advice, at "Scarface" producer Martin Bregman's request, and never took her to the theater. During his testimony Tuesday, Baldwin described several incidents involving her as being "like something out of Hitchcock."
Baldwin also stated that he never had a sexual or romantic relationship with Sabourin, saying that after they met, she began leaving dozens of voicemails for him a night and eventually started threatening to show up at his homes.
"It was nightmarish," he testified.
Sabourin has said their dinner date ended in sex, but she hadn't yet addressed that in testimony that was to continue Wednesday afternoon.
While the trial continues, she'll spend nights in jail.
The Associated Press contributed to this report.