Over the weekend, the 22-year-old singer was spotted at Barclays Center in Brooklyn, where her 21-year-old rumored beau performed two nights in a row.
During the concert, Cabello was seen gazing lovingly at the stage as Mendes wowed the crowd. Wearing a purple-and-orange floral dress, Cabello smiled as she adorably placed her hands in front of her mouth during Mendes' energetic performance.
Following the show, Mendes even took to Instagram to declare that there had been "magic in Brooklyn" during the concert.
"Shawn and Camila originally were just enjoying spending time together and having a summer fling," the source said. "Camila had just got out of a relationship and Shawn was in the middle of a massive tour. However, Shawn and Camila have really fallen for one another.”
The 2019 MTV VMAs will air live from the Prudential Center in Newark, New Jersey, on Monday, Aug. 26 at 8 p.m. ET/PT.