In a recent adorable post, Baldwin can be seen sitting cuddled up in Bieber's lap as she flaunts her engagement ring.
"Absolute best friend," wrote the American model.
The much-in-love couple is planning to get hitched next year, reported TMZ. The exact date of the wedding, however, hasn't been announced yet.
The 'Sorry' singer took to social media on July 10 to confirm his engagement with the American model.
He also paid a loving tribute to his 21-year-old fiancee while also announcing his plans to marry her.