Katy Perry is under fire once again following her “Dark Horse” copyright lawsuit.

RadarOnline.com has learned one of her male music video costars has accused her of exposing his penis at a Hollywood party, allegedly leaving him feeling “pathetic” and “embarrassed.”

Josh Kloss, the actor who played her love interest in her 2010 “Teenage Dream” video, sha

red a lengthy Instagram post detailing the alleged humiliation he suffered at the hands of the pop star.

He said initially found Perry, 34, “cool and kind” — but her behavior changed around others on set.

“When other people were around she was cold as ice even called the act of kissing me ‘gross’ to the entire set while filming,” Kloss claimed.

“Now I was pretty embarrassed but kept giving my all, as my ex was busy cheating on me and my daughter was just a toddler, I knew I had to endure for her sake.”

Kloss shared a screenshot of the music video along with his statement, just in time for the song’s nine-year anniversary.

“After the first day of shooting, Katy invited me to a strip club in Santa Barbara. I declined and told her ‘I have to go back to hotel and rest, because this job is all I have right now,’” he continued in his allegations.

He claimed he saw Perry a couple of times after her 2011 break-up with ex-husband Russell Brand, but in one specific instance, he alleged she completely humiliated him.

“This one time I brought a friend who was dying to meet her. It was Perry’s creative director Johnny Wujek’s birthday party at Moonlight Rollerway.”

“And when I saw her, we hugged and she was still my crush. But as I turned to introduce my friend, she pulled my Adidas sweats and underwear out as far as she could to show a couple of her guy friends and the crowd around us my penis,” claimed Kloss.

“Can you imagine how pathetic and embarrassed I felt?”

Though Perry has not yet responded to Kloss’ claims, the actor explained that he wanted to share his message to make it clear that men, too, can be victims, especially of powerful women.

“I just say this now because our culture is set on proving men of power are perverse. But females with power are just as disgusting,” he wrote.

Kloss said he only made $650 from his performance in the “Teenage Dream” video and was warned by her handlers to not discuss a single thing about her in public.

Still, he said he sees Perry as “an amazing leader,” and thinks “her songs are mainly great empowering anthems.”

“So, happy anniversary to one of the most confusing, assaulting, and belittling jobs I’ve ever done. Yay #teenagedream” concluded Kloss.

“I was actually gonna play the song and sing it on ukulele for the anniversary, but then as I was tuning I thought, f**k this, I’m not helping her bs image another second.”