Katy Perry has broken her silence on her new romance with Justin Trudeau after receiving a marriage proposal from a fan live on stage.

RadarOnline.com can reveal the gesture prompted the singer, 40, to come clean about her relationship with the former Canadian Prime Minister, who she's been rumored to have dated since the summer. Article continues below advertisement

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During her show in London on Monday night as part of her Lifetimes work tour, Perry said she had to turn down the surprise marriage proposal due to her romance with Trudeau, 53.

She laughed: "I wish you'd asked me 48 hours ago."

Katy also added: "London, England, you're like this on a Monday night a

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