Baldwin, the daughter of actor Stephen Baldwin, started to date Bieber again after he broke up with singer Selena Gomez.
According to the report, 24-year-old Bieber popped the question after the two dated for just one month, though they reportedly had prior romantic ties.
Shawn Mendez and Hailey Baldwin arrive for the 2018 Met Gala on May 7, 2018, at the Metropolitan Museum of Art in NY.
He also tagged Bieber's parents Jeremy Bieber and Pattie Mallette and wrote "Congrats" while sharing a Bible verse.
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The happy couple have been inseparable after they rekindled their romance just one month ago, after previously dating years before.
Meanwhile, a source tells People, "It's kind of a surprise, but kind of not".
Two eyewitnesses told the website that Justin's security team asked people to put their phones away as something special was about to take place.
The pair got engaged on Saturday during a trip to the Bahamas, E!
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While the couple has yet to confirm the engagement rumors, Bieber's father gave the public a big clue.
Bieber and Baldwin have recently spent time together in Canada, New York City and the Hamptons on Long Island, New York, where they were photographed kissing and holding hands.
Bieber foreshadowed the possibility of marrying Baldwin in a 2016 interview with GQ. "He didn't wanna make it seem like Hailey really made him do it but I mean we all knew". We went through a long period of time where we weren't friends. "We spend a lot of time together", Justin explained in the 2016 article.
Get more info on Bieber and Baldwin's romance in the clip below.
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