She used to think Jennifer Lopez looked kind of tough.

But all that changed for one local fan after a fleeting encounter Wednesday night in Havertown, where J.Lo and beau Ben Affleck were filming scenes for their new movie, “Jersey Girl.”

“She didn’t look tough at all. She looked more petite and soft,” said fan Joanne Alegado. “She’s really, really pretty.”

And, despite Lopez’s reputation as a demanding, if sexy, diva who travels with a staff of 100 – including hairstylists, chefs and masseuses – and requires everything in her dressing room to be white, from candles to flowers, “She was just super nice,” said Alegado.

And so much in love.

Lopez and Affleck had wrapped up filming for the night at the old Haverford Hospital on West Chester Pike when Alegado and friend Chrissy Campitelli met up with them about 11 p.m. Wednesday.

Campitelli and Alegado were among about two-dozen well-wishers who crowded around the upscale SUV that was ferrying the stars.

For their trouble, the adoring fans were able to witness a big-as-life Hollywood kiss.

“They were talking to people and they just kissed,” Alegado said. “A little kiss. Just like a little cutesy, off-the-cuff kind of kiss. It was really, really, really cool.”

“They were very lovey-dovey. Really cute together,” said Alegado, 42, who works in advertising for the Daily News.

“I wasn’t really sure what to expect from her,” Campitelli, 23, who works for a Main Line catering firm, said of J.Lo. “She was really nice and down to earth.”

Campitelli said Affleck had displayed the same attitude when he signed an autograph for her that afternoon outside the hospital. He’d also gone out of his way to talk to a teen-age fan in a wheelchair and even answered a cell phone handed to him by another fan, she said.

“They were leaving for the night and they could have just driven away but they made [the driver] come over,” Campitelli said.

Both leaned out the rear window, talked and signed autographs.

They made a beautiful couple, Alegado said. “I said you’re both really gorgeous, because you look even better in person and not all celebrities do.”

Alegado said she’d been at an Oscar party in California and had seen some celebrities close up who looked “like they were laid out in a funeral home.”