Just after the two famous singers were seen getting hot and heavy Monday during a beach trip in Miami ... they moved the PDA party back to the hotel pool.
Mendes, 20, and Cabello, 22 were seen swimming together and looked as comfortable as could be in the water.
Mendes held his "Señorita" co-star in his arms as she laid back and stared into the sky.
During the swim play, Mendes stuck to black his Nike swim trunks while Camila sported a revealing white one-piece.
Prior to Cabello, Mendes has been linked to Hailey Bieber, his date to the 2018 Met Gala.
Obviously, she went on to marry Justin Bieber ... but Mendes seems to be pretty happy in his current situation.
As if the cool water wasn't enough, the Cuban-American singer also teased her alleged BF by enjoying some ice cream while in the pool.
The “Señorita” collaborators sparked dating speculation last month when Mendes’ mother commented with romantic emojis on a video that Cabello posted to Instagram.
Cabello split from longtime boyfriend Matthew Hussey in June and had been seen with Mendes on a number of occasions prior to the breakup rumors.
The couple hasn’t publicly commented on their relationship. In fact, Mendes even denied that he was dating Cabello on July 6, shaking his head “no” when a fan asked him about the rumors at a Q&A in Los Angeles.
Will be tough to keep that same answer the next time he's asked.