Las Vegas police have reopened a nine-year-old investigation into a model-turned-teacher’s claims that Cristiano Ronaldo raped her after a night of clubbing in 2009, the Post has learned.

Las Vegas native Kathryn Mayorga claimed in an interview with Der Spiegel published Friday that the soccer superstar assaulted her in his Palms Casino Resort suite while the two were partying with others.

Ronaldo asked her to join the group in a hot tub, then exposed himself after she went into a bathroom to change, Mayorga told the German news magazine. He demanded she touch his penis, she said.

“When I wouldn’t touch it, he begged me to suck it,” she said.

He then asked for a kiss, pulled her onto the bed, and raped her, Mayorga alleges.

“I turned away. He tried to take my underwear off. I turned away from him and curled up into a ball. And I was holding my vagina. And that’s when he jumped on me,” she said.

Ronaldo’s attorney, Christian Schertz, denied Mayorga’s accusations on Friday and threatened to sue Der Spiegel for what he called “an inadmissible reporting of suspicions in the area of privacy.”

Mayorga unmasked herself as Ronaldo’s anonymous accuser a year after the magazine reported that he’d paid an American woman $375,000 in hush money in 2010 over a rape accusation.

She says she regrets having signed the non-disclosure agreement.

Her lawyer, Leslie Stovall said he has filed a civil suit on her behalf seeking to have the deal thrown out.

Stovall claims Ronaldo admitted the sex was non-consensual in a questionnaire he answered as part of the settlement negotiations in 2010.

“She said no and stop several times,” Ronaldo allegedly told his lawyers.

Mayorga told Der Spiegel she went to the hospital the next day and reported the incident to police, but her lawyer at the time encouraged her to settle the matter.

Las Vegas cops told the Post on Saturday they couldn’t release the 2009 report because “it’s an open investigation.”

Meanwhile, Mayorga has gone into hiding. Trolls have already set up fake social media accounts in her name, and Ronaldo’s fans are jumping to his defense.

Additional reporting by Brad Hamilton