Ever since Shawn Mendes and Camila Cabello made their duet debut with "I Know What You Did Last Summer" in 2017, fans have noticed that the two singers have chemistry. While both stars previously denied being a couple, they've since been spotted kissing and holding hands in several cities this summer. Their passion for each other is so intense that some people are now wondering if, well... it could be real. These tweets claiming Shawn Mendes and Camila Cabello's relationship is "fake" are potentially kind of convincing. (Elite Daily reached out to reps for Mendes and Cabello for comment on the tweets and did not hear back in time for publication.)

After Cabello split from her boyfriend Matthew Hussey in June, the same month "Señorita," her new duet with Mendes, dropped, the singers have been regularly spotted by the paparazzi looking like they're, you know, more than friends. For instance, Us Weekly reports the two were spotted just casually holding hands in West Hollywood on July 4.

"They were sitting with each other, facing each other and look very intimate," an eyewitness told Us Weekly. "They left together holding hands." In addition to the eyewitness' testimony, paparazzi also managed to snap pictures of the two walking hand-in-hand.

Most recently, the two were reportedly spotted kissing each other at a cafe in San Francisco on July 13. Neither Cabello nor Mendes have confirmed or denied the existence of their relationship, so we still can't be totally sure. But some fans are still not convinced that their relationship is 100 percent legit. So much so that they've even taken to Twitter to share that theory that the relationship is a publicity stunt to promote "Señorita."