United Kingdom, Oct. 13 -- Katy Perry has reportedly been "constantly in contact" with Justin Trudeau since the summer.

The 40-year-old pop star was first linked to the former Canadian Prime Minister, 53, since July when they were seen enjoying a meal together in Montreal and now they have fuelled rumours of a blossoming romance after new pictures seemingly showed them embracing onboard a yacht off the coast of Santa Barbara, California.

Now a source has told The Sun newspaper the pair have stayed in touch even though Katy has been away on tour. The insider said: "They haven't been able to spend a lot of time together as she's on tour, but they're constantly in contact - always FaceTiming and messaging each other."

The source added: "H...