The couple reignited their relationship last month, a they were seen kissing on June 18. When asked about her previous romance with Justin, she explained, "Justin and I were friends for a long time".
GettyJustin Bieber performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York.
A source told PEOPLE, "It's kind of a surprise, but kind of not".
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While today's announcement of Justin Beiber and Hailey Baldwin's engagement raises similar questions, this kind of hasty decision making all in the name of love isn't new or exclusive to celebrities. "This might seem sudden, but they know each other very well", the source continued.
Hailey may have hinted that an engagement was imminent after sharing a photo of herself with a ring on THAT finger on Instagram on Sunday, 1 July. "The older Bieber captioned the image, "@justinbieber Proud is an understatement! "Excited for the next chapter!"
Justin's mum, Pattie Mallette, also posted a mysterious message on Twitter at the same time simply saying, "Love Love Love Love Love Love Love".
It's hard keeping up with Justin Bieber's love life.
The fan reaction on social media was somewhat mixed, as some were happy to see the two together while others were sad the 24-year-old singer was no longer on the market.