The couple, who dated for two years before divorcing in 2021, were spotted outside a comedy gig at Hollywood Improv on Wednesday, only two weeks after photographs and video of them kissing at Coachella went viral.
Mendes, 24, and Cabello, 26, can be seen walking close together and smiling in photos from their most recent outing in Los Angeles, before embracing in a massive hug.
Mendes wore a cosy white turtle neck and tan flare trousers with black shoes, while Cabello completed the ensemble with a white button-up, black vest-turned-dress, and a purse.
The encounter comes just a week after a source told HotGossipNewz that the "I Know What You Did Last Summer" colleagues had continued to hang out regularly since returning to Los Angeles. "They are enjoying daytime strolls and nighttime casual dinners out," added the insider. "They have been hanging out just the two of them."
The source also stated that the couple's reunion is going well: "They are very cute, keep holding hands and laughing." They appear to be overjoyed to be reunited."
The couple fuelled suspicion that they were back together following their Coachella kiss when they were photographed holding hands while walking together in Los Angeles' Venice neighbourhood on April 19.
Jessica Rendall, an Australian journalist who shot video of the pair, told HotGossipNewz at the time that they appeared to be in excellent spirits. "I must have had a shocked expression on my face because Shawn gave me a knowing smirk as they passed," she explained. "They were deep in conversation but appeared to be very comfortable and happy together."
"How do you get to be so much better?" Is this ever going to end? / I guess I'll f--- around and see if you're going to Coachella? If you don't, it's whatever / If you do, honey, it'll be all I think about," Cabello sang on her phone's single "June Gloom."
Before dating in 2019, the couple had been pals since the mid-2010s. They stated in a joint statement that they intend to "continue to be best friends" despite their breakup in 2021.