New York ? It seems Ashlee Simpson will forever bear the scarlet “L” — for lip-synching. The 20-year-old “singer” has been lampooned and shamed, held up as an example of today’s style-over-substance culture — all because of one lip-synch gone famously awry on “Saturday Night Live.”

Yet must Simpson bear the cross alone, while all the entertainment world goes free? Consider this:

• Now-classic footage from shows like “American Bandstand” featured artists lip-synching.
• Michael Jackson mouthed part of his superstar-making moment on the “Motown 25” TV show in 1983.
• Whitney Houston’s spine-chilling rendition of “The Star-Spangled Banner” at the 1991 Super Bowl was prerecorded.
• And perhaps the only moments when Britney Spears did not lip-synch during her recent tour was when she said hello and goodbye to her audience.

“It doesn’t make the least bit of difference,” Dick Clark, America’s oldest teenager and the creator of the now-defunct “American Bandstand,” told The Associated Press.

“Every motion picture you’ve seen, every ‘American Bandstand’ you saw, most of all MTV you see, it’s all lip-synched,” he said. “(What’s important is) the impression you get as an audience. If you’re pleased with what you saw, who gives a hoot how it got to you?”

A teary Ashlee Simpson, right, runs off stage clutching her throat at the dress rehearsal for NBC's Saturday

It never seemed to matter in the past.

We’ve all watched performances where singers dance, prance, and almost do back-flips while singing — but aren’t a bit out of breath. Or when they sing earnestly to a prerecorded ballad during a TV show. Or rap along to their own song, a la Eminem, also on a recent “Saturday Night Live.”

Producer Jimmy Jam, who’s worked with artists ranging from Janet Jackson to Usher, said he too was surprised over the Simpson incident — surprised that it was such a big deal.

“I thought everybody knew that everybody lip-synched,” he said. “I just thought when you went and saw Britney Spears, you knew that she lip-synched the whole concert. … They’re seeing a show, and to them, that’s what a show is.”

Not for everyone. R&B veteran Patti LaBelle, known for her booming voice and creative improvisations, lamented that “the whole world is so phony today, so people are accepting it. People are loving phonies.”

Sounding hoarse from recent performances, LaBelle said she never lip-synched at shows. But she’s seen plenty of it, and not just from singers with feather-light voices.

“I was surprised when I heard some of the people who were doing it,” she said. “When some of the bigger stars who can sing their butts off are using some enhancements, I’m like, why?”

But P. Diddy says the practice has become standard, especially in an era where it’s become more common for entertainers to do everything but juggle onstage.

“So many people at times have used backup tracks. I just think (Simpson) was the first one that had a mishap on it. I’ve heard her sing live. I don’t think she’s doing no Milli Vanilli,” he said, referring to the infamous duo that didn’t even sing the vocals they were lip-synching to.

“That’s the way the ball bounces,” Diddy said. “I don’t think she’ll be the last one to sing along to a track.”