A woman accused of stalking Alec Baldwin took the witness stand on Wednesday to describe a romantic night she said she had with Mr. Baldwin in February 2010.
The woman, Genevieve Sabourin, 41, lit up when she talked about a monthlong telephone flirtation with the actor that led him to invite her to spend a weekend with him in New York.
He charmed her, she said, driving through Central Park, taking her to a popular new play, introducing her to actors backstage, then on to a quiet dinner at Elios Restaurant. The night ended at the Hotel Lowell, where, she said, they had sex.
“It was a beautiful, romantic evening,” she testified. Later she added, “It was more than romantic; it was perfect.”
Her testimony contrasted sharply with Mr. Baldwin’s account on Tuesday. He testified that he met Ms. Sabourin only once, to advise her about her acting career; he denied having a sexual tryst with her.
The proceedings in Ms. Sabourin’s trial on stalking and harassment charges had barely gotten underway on Wednesday when Judge Robert Mandelbaum lost patience with her repeated outbursts and ordered her to spend 30 days in jail for contempt of court.
“That’s it,” he said, when Ms. Sabourin complained loudly that her lawyer had not called a particular witness. “You are held in contempt.”
Ms. Sabourin broke into tears and delivered a long, rambling monologue about how the pressures of the trial had worn her down. “I couldn’t sleep last night,” she said. “I couldn’t eat for two weeks. They vilify me in the press. They beat me up for two years.”
But an hour later, she was beaming when she started testifying about what she described as a love affair with Mr. Baldwin.
Ms. Sabourin, a Canadian publicist and aspiring actress, met Mr. Baldwin in 2000 during the filming of the sci-fi comedy “The Adventures of Pluto Nash.” He had a cameo role, and she was a publicist, working for the producer, Martin Bregman.