The 24-year-old pop singer reportedly proposed to Baldwin, 21, in the Bahamas on Saturday night. Baldwin is the daughter of actor Stephen Baldwin and niece of Alec Baldwin.
“It’s kind of a surprise, but kind of not. Justin has been extremely happy these past few weeks,” a source told PEOPLE. “He has known Hailey for a long time. This might seem sudden, but they know each other very well.”
Bieber’s father Jeremy, hinted at his son’s engagement on Instagram, writing: “@justinbieber Proud is an understatement! Excited for the next chapter!” His mother, Pattie Mallette, tweeted: “Love Love Love Love Love Love Love.”