A little distance is no match for Katy Perry and Justin Trudeau.

The pop star, 41, and the Canadian politician, 54, are going strong several months into their romance despite busy schedules, a Perry source tells PEOPLE.

“The priority for both of them is stability for the kids. Katy and Justin have had to be flexible to make the relationship work,” the source says. “They travel whenever they can to spend time together. The long-distance dynamic was never a surprise to them.”

Perry is mom to daughter Daisy Dove, 5, with ex-fiancé Orlando Bloom, while Trudeau shares sons Xavier, 18, and Hadrien, 12, and daughter Ella-Grace, 17, with estranged wife Sophie Grégoire Trudeau.

The source says that both the “Firework” singer and the former prime minister “understood from the beginning that their lives were complicated and that it wouldn’t be the easiest relationship logistically.”

Still, the pair “really wanted to see where things could go, and have been determined to make it work.”

Why Katy Perry and Justin Trudeau Are 'Determined' to Make Their Long-Distance Relationship Work: Source (Exclusive)

Perry wrapped her Lifetimes Tour in December after nearly 100 shows, and the source adds that while she was on the road, Trudeau often made an effort to travel to see her.

“She fell for him early on because he really showed that he was interested,” the source says. “They’ve already had to navigate a lot of logistics. The fact that they’ve been willing to do that says a lot about how serious they are about each other.”

Perry and Trudeau were first spotted together in Montréal in July, and made their relationship Instagram official in December.

The singer has since shared a number of photos of Trudeau to Instagram, including a recent post that included a selfie of the pair with Perry making a funny face. In another photo, Trudeau held a wand made of pipe cleaners while sitting at the dinner table with a pipe cleaner headband.

Trudeau’s son Xavier revealed in an Instagram video in February that he’s met Perry, and she has his stamp of approval.

“She’s cool, she’s nice,” he said. “We talked for hours, talking about my music. She gave me advice and next steps for me and stuff.”