The duo are currently in Montreal and apparently packing on the PDA, according to a local who spotted them at a diner on Monday.
The eyewitness snapped a photo of the couple looking adorable with each other over breakfast.
Now, bear with us because his Tweet is in French, but basically what the witness says is that Cabello and Mendes couldn't keep their lips off each other.
That pretty much mirrors the behavior we've been seeing from the duo ever since their trip to Miami.
The singers caused major heatwaves when they were spotted making out -- not once, but twice -- in the Sunshine State last month.
Cabello and Mendes confirmed their rumored romance when they locked lips during a day at the pool.
Since then, they have been inseparable.
Cabello jetted to New York City last week to help Mendes ring in his 21st birthday. The famous singers couldn't keep their hands off each other at that party either.
As The Blast reported, they were seen dancing and locked in an intense makeup session in front of Mendes' family and friends.
Cabello even dropped the L-word when she wished the singer a happy birthday.
Romance rumors began to swirl between the two earlier this summer after fans noticed their on-screen heat in their music video, "Señorita."
That same month, Cabello revealed she split with her boyfriend of nearly one year, British dating expert, Matthew Hussey.
Isn't love great, eh?