Meanwhile, a source tells People, "It's kind of a surprise, but kind of not".
One source confirmed that the engagement happened last night!
Hailey recently gushed over her beau when addressing the first time they had split up. Justin is happier than ever and wants to be with Hailey.
Justin and Hailey are, of course, no strangers to each other, so it makes sense that they'd take this step at some point, perhaps. "Excited for the next chapter", he wrote.
The couple, which previously dated in early 2016, rekindled its romance last month and has been inseparable ever since, travelling to Florida and NY together, before jetting off to the Bahamas.
Boris Johnson brands Theresa May's Brexit plan 'an absolute stinker'
I will certainly stick to the Conservatives' manifesto commitments, and will not vote for something that doesn't deliver Brexit. The proposal would allow free movement of goods, but not of services.
Some of the reactions were amusing, like @amandabehling's tweet that read, "Justin Bieber out here really making Hailey Baldwin his one less lonely girl". They've dated before, and it appears they hooked up again just after Justin and Selena Gomez broke up.
Justin and Hailey have been inseparable since they made a decision to give romance a second shot in June.
She explained: "Justin and I were friends for a long time". It was what it was.
'We didn't speak for quite some time and there was a lot of weirdness that went on, ' she continued.
Justin and I were friends for a long time, ' the 21-year-old told The Times in May. 'We've moved past that.
Get more info on Bieber and Baldwin's romance in the clip below.