Katy Perry and Justin Trudeau’s Relationship ‘Is Already Fairly Serious’ 3 Months After Their First Date: Source (Exclusive)

NEED TO KNOW

• Katy Perry and Justin Trudeau made their first public appearance as a couple in Paris on Saturday, Oct. 25

• The pair first sparked romance rumors over the summer when they stepped out for dinner in Montreal in July

• “They are very much…