The Teenage Dream singer has been linked with the former Canadian prime minister for several months and during her show in Prague on Thursday, she made reference to her current relationship status when she spotted a sign from a fan asking her to marry them.
"This guy is trying to get me to marry him and he has a ring in his hand," Perry could be heard telling the crowd in a video shared on TikTok.
"No. I am dating someone else for crying out f***ing loud."
It's not the first marriage proposal Perry has received on her Lifetimes tour.
During a show at The O2 Arena in London in October, audience member Darren Trenchard was invited onto the stage and took the opportunity to pop the question to the 41-year-old pop star - who has five-year-old daughter Daisy with ex-fiance Orlando Bloom and was previously married to Russell Brand - but she turned him down.
"I wish you'd asked me 48 hours ago," she said.
"London, England, you're like this on a Monday night after a whole day at work and a whole day at school?
"No wonder I fall for Englishmen all the time … but not anymore."
Perry and Trudeau made their first public appearance as a couple when they paid a visit to the Crazy Horse Paris to celebrate her 41st birthday at the cabaret show in October.
Pictures obtained by TMZ showed the couple walking out of the French venue holding hands and smiling at one another, with Perry wearing a vivid red dress and the 53-year-old politician in an all-black outfit.
The pair were first romantically linked when they were spotted on a date in Montreal, Canada, shortly after the Dark Horse singer split from fiance Orlando Bloom in June.
They were next photographed together in October, kissing on a yacht off the coast of Santa Barbara.
It was reported the pair are "quite taken with each other".
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