Article continues below advertisementIt looks like Katy Perry and new flame Justin Trudeau are the real deal!At her London concert on Sunday, October 12, she brought a male fan onstage - only for him to unfold a poster and ask the pop star to marry him.Article continues below advertisementKaty Perry Hints She's Not SingleSource: megaAfter a fan proposed to Katy Perry onstage, she replied, 'You heard I'm single? That's interesting.'"I heard you're single," said the fan, whose name is Darren."You heard I'm single? That's interesting," the mom-of-one replied, as seen in a TikTok.