Exactly 12 months ago, Kristen Stewart and Robert Pattinson were surprised to be greeted by throngs of eager fans of the novel “Twilight” at the premiere of the big-screen adaptation.

What a difference a year makes.

The actors unveiled the sequel — “The Twilight Saga: New Moon” — at the same location Monday night in the Westwood neighborhood of Los Angeles.

But this time they knew what was coming.

“I’m not as scared as I was last year,” said Stewart, despite a brief touch-and-go moment as she signed autographs.

“At some point, the security guy said, ‘This is very unsafe.’

And I was like, ‘Uh.’ Other than that, everything was cool.”Pattinson, who plays vampire Edward Cullen in this latest adaptation of author Stephenie Meyer’s popular series, said this year’s crowd of thousands of screaming fans was larger than the 2008 turnout.

“And it seems different to me because we have done this world tour in the last week and it has just been unbelievable in every single city,” he said. “It is about 10 times bigger than any other city in the world.”

Some “twi-hards” __ as they call themselves __ arrived as early as Thursday afternoon to secure a place in line for tickets allowing them to watch the stars’ arrivals on the red carpet. The 800 available tickets were all distributed by Monday morning, but the line still stretched for blocks well after lunchtime.

Nicole Zamora, 36, was sixth in line after getting to Westwood on Thursday afternoon. She and her three sisters wore “New Moon” T-shirts they’d made for the occasion and said they spent the weekend “reading, listening to the iPod and trying to sleep — anything to pass the time.”

Christina Fuentes and four of her friends traveled from New Jersey for the “New Moon” premiere.

The 24-year-old wore vampire teeth (“They just clip on,” she said) and carried a homemade sign that read, “We flew in from NJ!

We’ve been camping out for three days just to see you!” She pasted her airline boarding pass to the poster as proof.

Scores of other fans — mostly young women — crowded onto street corners near the Mann Village and Bruin theaters, site of the premiere.

They sat on beach chairs, displayed homemade signs and wore T-shirts proclaiming their allegiance to either the handsome vampire played by Pattinson or his werewolf rival, Taylor Lautner.

Lautner, who rises to headliner status in “New Moon,” said he was also amazed by Monday’s fan response.

“It’s the amount of passion,” he said. “It’s not normal.”

• Mike Cidoni