Hailey Baldwin's ''absolute best friend'' is Justin Bieber.

The 21-year-old model - who got engaged to the 'Love Yourself' hitmaker last month after just a few weeks of dating - paid tribute to her fiance in a new Instagram post on Sunday (19.08.18).

Hailey shared a photo of herself and Justin, 24, cuddling on a boat, with her huge diamond engagement ring on display, and captioned the image: ''absolute best friend.(sic)''

It was recently claimed the couple - who first dated in 2016 - are not in a rush to get married because they just want to ''enjoy'' their relationship.

A source said recently: ''The couple have talked to a lot of people close to them, and are listening to the constant advice they've been receiving to 'enjoy the ride.' [They are] in a loving relationship and are working on the foundation now to maintain the forever.''

Justin proposed to Hailey during a trip to the Bahamas last month, and later confirmed the news on Instagram in a sweet tribute post dedicated to the blonde beauty.

The 'Sorry' singer wrote: ''Was gonna wait a while to say anything but word travels fast, listen plain and simple Hailey I am soooo in love with everything about you! So committed to spending my life getting to know every single part of you loving you patiently and kindLY. I promise to lead our family with honor and integrity letting Jesus through his Holy Spirit guide us in everything we do and every decision we make. My heart is COMPLETELY and FULLY YOURS and I will ALWAYS put you first! You are the love of my life Hailey Baldwin and I wouldn't want to spend it with anybody else. You make me so much better and we compliment eachother so well!! Can't wait for the best season of life yet!. (sic)''