The Teenage Dream hitmaker posted a new selfie to her Instagram on Friday, which made waves amongst her millions of fans since she was almost a spitting image of songstress Adele in the snap.
While the picture was meant to promote Katy’s new song Not The End Of The World, the pop star drew many comments from her 108 million followers who wondered whether the picture was indeed of her, or of the Hello hitmaker, 32.
New mum Katy wore her blonde hair long and slightly crimped in the dreamy and sultry picture.
She stared at the camera wearing heavy mascara and winged eyeliner, which is a trademark of Adele's.
The American beauty also wore a statement dress in metallics that rivals some of Adele's best and most show-stopping looks.
The second part of the post was a video showing Katy on the edge of a spaceship overlooking planet earth in a sepia and starlight-filled environment.
And in the comments section, one fan openly wondered: "Is that Adele?"
Another wrote: "At first glance I thought this was Adele."
A third echoed: "Adele, is that you?"
While a fourth said: "Adele?"
This is not the first time this year the two women have been confused for one another, with Adele shocking with her Katy resemblance as she marked Notting Hill carnival on Instagram this summer.
He said at the time: "This is truly shocking… when did Adele become Katy Perry?"
Fans have since been sharing examples showing how much the pop stars look alike.
One said: "I’m sorry but I saw this three times and thought it was Katy Perry. I never saw the Adele comparison until now."
"Adele looks more like Katy Perry than Katy Perry does these days," agreed another.
Someone else added: "Adele's weight loss led to her being Katy Perry. Wtf."
Katy and Adele are not only friends but also neighbours.
Earlier this year, while Katy was pregnant with her first child Daisy Dove Bloom with fiance Orlando Bloom, she even described how Adele would come over and visit while she was still wearing her house robe.
The Roar singer told Hits Radio Breakfast: "She just knocks on my door and comes in" whenever she's in Los Angeles."
However Katy admitted at the time that she hasn't seen Adele since she transformed her figure with a whooping 98 pounds weight loss.