LOS ANGELES •The couple dated in 2016, but had broken up.
However, last month, Justin Bieber and Hailey Baldwin appeared together publicly, leading to talk from fans that they had rekindled their romance, CNN reported.
On Sunday, various American media reported that pop singer Bieber, 24, had taken the next step by getting engaged to model Baldwin, 21.
E! News revealed that the pair chose Saturday during a trip to the Bahamas to further cement their relationship.
Bieber reportedly popped the question in a crowded restaurant.
Agents for the couple did not immediately respond to requests for comments, but his parents put up social-media posts that helped spark speculation about the pair.
A tweet posted by the model's father, actor Stephen Baldwin, also seemed to allude to the engagement, saying: "Always pray 4 Gods will !! He is moving in the hearts of JB&HB."
The romantic status of the Canadian-born pop singer, one of the world's biggest-selling musical acts, is of acute interest to his fans who are called Beliebers.
Online, some of them, who had grown up following Bieber, jokingly lamented that their hopes of getting hitched to him had been dashed, even as he had dated singer-actress Selena Gomez on and off for years.