So, does Joseph Schooling have a girlfriend? And is it an American student by the name of Casey Shomaker?
That's been the burning question among many of his female fans, especially after photos of the couple appeared on both their social media feeds.
When Schooling, 21, returned to Texas recently, Ms Shomaker posted a photo on her Instagram account showing both of them at the airport with a sign that read "Joe Schooling, Olympic Champion". She captioned the photo: "So good to have this one back! Thanks for taking care of him, Singapore!"
Her Instagram account, as well as his, shows other pictures of them together.
Ms Shomaker, 22, is said to be doing a doctorate in law at the University of Texas.
When the issue of who greeted Schooling at the airport was raised yesterday, his mother, Mrs May Schooling, said she was "one of his friends".
She added: "And let me tell you, I'm happy he has female friends. If he doesn't, I'd be worried, okay? But he has many female friends."