Russell Brand once joked about raping and killing a woman in an onstage interview 10 years before UK cops confirmed Monday that he is being investigated over allegations of sex assault.

The 48-year-old embattled star made the off-color comments — along with jokes about sex with kids and homeless people — in a 2013 interview with Richard Herring that was shared by the Daily Mail after being widely deleted from YouTube.

While admitting he was a “sex narcissist,” Katy Perry’s ex-husband told Herring that his biggest secret was that he was actually “just a bloke from Essex, from a single-parent family [who’s] a pretty comprehensive show-off.”

“It’s not my extremism that I need to protect, it’s my mundanity … if there’s anything being protected, it’s that,” he said.

“Oh — and also I raped someone once,” he added with a laugh as some in the audience gasped.

“I killed her after,” Brand added with a grin. “She’ll never tell.”

In the same interview for Herring’s podcast, Brand — whose accusers include a then-16-year-old he allegedly called “the child” — joked about the ancient Greeks’ proclivity for having sex with minors.

“They didn’t mind it, and they was clever, weren’t they?” the actor asked — mimicking someone having sex.

“I’m f—ing a little kid! This is great!”

Brand went on to joke about adults, like baby-sitters, having sex in front of children — including himself when he was a kid — and suggested he had sex with half the women in the audience.

Later on in the interview, Herring asked Brand about his use of homeless people to promote his Messiah tour, asking whether, as a millionaire comedian, he thought it was “exploitative.”

“You should have seen what happened after the video,” he replied, as he mimed having sex with a homeless person and putting out a cigarette on them.

“Who’s going to care? Who are you going to tell?” Brand asked. “If society cared, you wouldn’t be homeless.”

The interview has since been removed from YouTube and SoundCloud amid allegations from four women who claim the actor raped, sexually assaulted and abused them.

It re-emerged as London’s Metropolitan Police on Monday said it was investigating “a report of a sexual assault which was alleged to have taken place in Soho in central London in 2003.”

That is three years before the earliest of the alleged assaults reported in a joint investigation published Saturday by the Times of London and its Sunday team along with Channel 4 “Dispatches.”

The force also urged “anyone who believes they may have been a victim of a sexual offense, no matter how long ago it was, to contact us.”

The UK Times said Monday that more women had contacted the newspaper with allegations against Brand and that they would be “rigorously checked.”

Brand has vehemently denied any wrongdoing, and has instead blamed the “mainstream media” for the “litany of astonishing, rather baroque attacks.”

One woman, identified as “Nadia,” alleged that the “Get Him to the Greek” star raped her against the wall of his Los Angeles home in 2012 and she was treated at a rape crisis center the same day, according to medical records cited by the outlets.

Russell Brand sexual assault allegations

Brand was accused of raping, sexually assaulting and abusing four women over the course of seven years from 2006 to 2013.

• One woman, identified as “Nadia,” alleged the “Get Him to the Greek” star raped her against the wall of his Los Angeles home in 2012 and that she was treated at a rape crisis center the same day, according to medical records cited by news outlets.
• Another accuser, who was 16 at the time and is known only by the pseudonym “Alice,” alleged the then-31-year-old called her “the child” and assaulted her during their “emotionally abusive and controlling” three-month relationship, according to the report.
• A woman identified as “Phoebe” claimed he sexually assaulted her at his property in West Hollywood after they met at an Alcoholics Anonymous meeting, according to the Times of London. Brand allegedly trapped her in a bedroom and chased her around before pinning her down and assaulting her. 
• The star’s ex-girlfriend Jordan Martin made similar accusations in her self-published 2014 book “kNot: Entanglement with a Celebrity.” She claims he sexually assaulted her at the Lowry Hotel in Manchester, England, after becoming angry that she had spoken to an ex-boyfriend in 2007.
• Pop star Dannii Minogue angrily labeled Brand a “vile predator” as far back as 2006 — accusing him of creeping her out by perving over her “fabulous breasts” and refusing to “take no for an answer.”

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Brand denied the allegations in a video on YouTube and X, formerly Twitter, alerting fans to “serious criminal” allegations that he said would be made against him.

“Amidst this litany of astonishing, rather baroque attacks, are some very serious allegations that I absolutely refute,” Branded shared. “The relationships I had were absolutely, always consensual.”

While the investigation proceeds, YouTube has suspended Brand from making money on the video streaming site, his pub “Crown Inn,” located in Pishill, Britain, has been temporarily shut down and BBC has formally launched a review into the comedian’s time at the network.

The woman later told Brand that she had been scared and felt taken advantage of, telling him, “When a girl [says] NO, it means no” — to which he responded he was “very sorry,” text messages cited by the report show.

Another accuser who was 16 at the time alleged that the then-31-year-old called her “the child” and assaulted her during their “emotionally abusive and controlling” three-month relationship, according to the report.

The woman — who is known only by the pseudonym “Alice” and was above the age of consent in the UK — said Brand was “grooming” her, an allegation a relative backed up to the Sunday Times during its investigation.

She claimed Brand would allegedly provide her with scripts on how to deceive her parents into allowing her to visit him, and claimed he would send his “BBC car” to pick her up from school. The broadcaster is investigating these allegations.

Brand’s other accusers include a woman who claimed he sexually assaulted her at his property in West Hollywood after they met at an Alcoholics Anonymous meeting, according to the Times of London.

The woman, identified as “Phoebe,” said at one point, she realized other staff left and she was alone with Brand.

She realized Brand wanted to have sex with her and said he eventually trapped her in a bedroom and chased her around before pinning her down and assaulting her.

“I saw something come over his eyes, I swear to God, like, black, his eyes had no more color, they were black, like the devil,” she recalled to the outlet. “Like a different person literally entered his body.”

“I think he had his hands down my trousers but I was fighting so hard and I was screaming so hard, hoping that I could get through somehow,” she continued, “I don’t know what the actual definition of ‘sexual assault’ is, but it feels like that. He didn’t rape me.”

Both Channel 4, where Brand hosted a spin-off of the station’s successful “Big Brother” show, and the BBC said they were investigating.

With Post wires