And, Perry pointed out, the pair even share a name!
"When we text, it's like 'Hudson here,'" Perry, whose real name is Katheryn Hudson, said during the SiriusXM Town Hall on Tuesday, Oct. 15. "We are buds and we get along. …We have become friends and go to game nights together, we play this game called Mafia … we play it all the time."
Among the games that Perry, 28, and Hudson, 34, play with their pals are Mafia and running charades.
"We stopped going to clubs and we started staying home and having game nights, which is really fun," Perry continued. "And she is super cool, she is gorgeous, to die for."
A few of Perry's other current girl crushes include Stevie Nicks, Gwen Stefani, and current on-the-rise pop star Ariana Grande.
"I love her so much," the Prism singer gushed. "She has the best female vocal in pop music today, I would say. She has literally the best voice. Best voice live. She kills it."
"And I got to hang out with her and listen to her record [Yours Truly] before it came out because I wanted to reach out to her and just be like,'Hey girl, you're just about to go through a whirlwind,'" she said.
To prepare for her own whirlwinds -- recording Prism, the followup to the mega-smash Teenage Dream -- the pop star said she escapes home to Santa Barbara, where she can feel like herself again.
"My hometown is a lot of the reason why I get to kind of go back to the feeling of when I was a teenager, when I was 13 and I picked up the guitar and was inspired by music," she said. "And I still am inspired by music but it’s nice I get to go home to Santa Barbara and feel like Katheryn Hudson, which is who I really am."