JUSTIN Trudeau was seen dancing at Katy Perry's concert after their 'cozy date night' this month, but the pop star's friends are allegedly wary of their new 'flirty friendship'.

Perry, who is single after recently splitting from her fiancé, Orlando Bloom , is on tour in Canada and had dinner with divorced Trudeau on Monday evening.

Trudeau was seen beaming in photos published by TMZ as he chatted to Perry while dining at Le Violon restaurant in Montreal .

Eyewitnesses revealed it wasn't just a quick dinner with a friend, as they started their evening with a 90-minute walk around Mount Royal Park with Perry's dog, Nugget, according to ET.

They then headed for dinner before stopping at Tavern Atlantic for a nightcap, where Trudeau ordered a whiskey and Perry sipped on

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