Pat Boone was once one of America’s biggest stars, starring in a host of flawless films – but the actor says Hollywood is now going to hell in a hand basket.

The 87-year-old – who is a devout Christian – lambasted the entertainment industry in an interview with Fox News on Tuesday, saying “moral values” are missing from TV shows and movies today, who “celebrate” bad behavior.

“On TV you can hear all kinds of swearing,” Boone said. “Nothing less than actual pornography is celebrated on television now. I don’t know how to say it loud enough, but I just think the film industry is killing itself. It’s killing itself in what I America’s image is being destroyed.

Boone claimed that studio executives were resorting to shock tactics in a desperate attempt to get ratings.

“Everything is upside down,” he complains. “Some of the biggest movies now show people getting away with the worst things. Violators are even celebrated. Criminals are getting bigger and bigger. Heroes do worse than criminals and are rewarded for it.

The star picked up the raunchy series ‘Big Mouth’ on Netflix – a crude animated comedy about the exploits of seventh graders designed for adult viewers.

“Here’s a young nerd – and he and his friends are learning about masturbation, oral sex – all kinds of stuff,” Boone lamented. “And it’s on Netflix. I don’t even know how they can even defend him, but he’s there. Everything is there. Parents will just see it’s an animated show and think it’s good for their kids to watch it… I mean, how bad can we get?

Boone rose to fame as a singer, becoming the second-greatest artist of the late 1950s, behind Elvis Presley.

The star quickly transitioned into acting, appearing in a number of family hits including ‘Bernardine’, ‘April Love’ and ‘All Hands on Deck’.

Boone has long been a devout Christian, and even told Fox News that he turned down a potential project that also starred Marilyn Monroe because he found the proposed script “immoral.”

“A teacher once said to me, ‘It’s always good to do good, and it’s always wrong to do bad.’ It sounds so simple, but it’s one of the lessons I always try to follow, even in my career,” the veteran star explained. “It was a moral lesson. I turned down songs with lyrics I just couldn’t sing. It didn’t feel right to do so. The same applies to movies and television.

At 87, Boone is still in good shape and eager to continue working if producers can provide the proper equipment.

“I just want to do good in my job and not succumb to anything,” he said. “I don’t give up my moral code for the box office.”

Boone’s Fox News interview comes less than two months after his daughter Debby defended her father in an interview with The Post after he was accused of covering songs by black artists.

“I know the whole story, or at least the story as it was told to me,” she said. “I know how people see it but I know my dad and I know he was younger than me (and my success) at the time.”

“One of the perspectives that I had and I loosely hold it and what I was told was that at the time he was covering these records these records would not have been released and exhibited as very white versions of my dad, and in some ways he and others like him opened the doors for them to become more widely known,” she said.

Boone charted his first No. 1 hit at age 21 with a 1955 cover of the Fats Domino song, “Ain’t That a Shame.” He continued with covers of “Tutti Frutti” and “Long Tall Sally”, by Little Richard.

Debby admitted that some might view her beliefs as “a very naive perspective – but I know he [her father] and Little Richard had conversations. Little Richard had a kind of resentment about it and he and my dad came to a real acceptance together that this was the way it should be.