Fans confused as video of Katy Perry yelling at woman and calling her a ‘b****’ goes viral

Katy Perry appeared to have a heated altercation with another woman in a video that's gone viral.

The ordeal is said to have happened as Perry celebrated her 40th birthday on October 25.

For the occasion, the 'Roar' hitmaker hosted a 1940s-themed party at the Ritz-Carlton in the Swiss city of Geneva.

Perry's also said to have rented out CERN’s Globe of Science and Innovation, with her party guests going on to have a private tour of the research center followed by boat rides on Lake Geneva, The Standard reported.

But the celebrations seemingly took a turn for the worst when the singer appeared to have an argument with a member of staff.

In a clip doing the rounds online, a woman says something about there being 'a terrible mistake'.

Perry seemed to reply: "It wasn't just a CNTRL ALT DELETE, b*tch."

The video was originally posted by fashion director Breck Lombardi on Instagram, who was in attendance at Perry's party.

Some people online speculated that the incident had something to do with Perry working with Dr. Luke, which she received criticizm for working with again in light of Kesha's accusations against the producer of 'sexual, physical, and emotional abuse', but it's thought that it was completely unrelated.

In fact, the ordeal is said to have been part of some 1940s theatrics that were planned in Perry's birthday celebrations.

Reportedly, she had a Murder on the Orient Express-themed party on a train that was traveling across Europe.

Film costume designer Johnny Wujek posted pictures of the exclusive soirée on Instagram, where he and other guests were all seen in period costumes and partying on the train.

He penned alongside a series of snaps: "We Orient Expressed our LOVE for the one and only @katyperry to celebrate her 40th trip around the Sun. If anyone knows how to throw a Party it’s KP."

Following the clip of Perry going viral, her fans were quick to come to her defense at they explained the situation.

"She [is] literally on a Cluedo train experience," someone said.

Another person wrote: "I hate to be this person but, is there any world where this confrontation was staged?"

A different Twitter user argued: "Someone community note this sh*t. This is her murder mystery bday party."

"This is clearly some sort of murder mystery event/dinner," wrote another.

"You can see from people laughing around them and everyone being dressed up."

UNILAD have approached Perry's reps for clarification.