Hailey Baldwin and Justin Bieber. Picture: Supplied

Hailey Baldwin is "blown away" by everything Justin Bieber does, as she finds her beau - whom she reportedly married last month - "incredible".

The 21-year-old model reportedly tied the knot with her fiancé last month - although neither of the pair have confirmed the news - and she has now gushed about the 'Sorry' hitmaker, saying she finds him "incredible".

She said: "He is incredible. He crushes everything. Every song, every feature. It's crazy to see what he does. I'm always blown away."

After finding love with the 24-year-old singer, Hailey has hinted she could be looking to start a family with him, after stating she's leaving space on her body for tattoos of her children's names.

Speaking to Harper's Bazaar magazine, she added: "I want more [tattoos] but I'm keeping space for my kids' names, and certain sentimental things, and I don't want to fill all the cute spots before ... I get there."

Hailey and Justin were thought to have tied the knot on the day they received their marriage license in New York on September 13, but the blonde beauty later denied claims.

She said: "I understand where the speculation is coming from, but I'm not married yet!"

However days later, her uncle Alec Baldwin claimed his niece and the 'Love Yourself' hitmaker had "just went off" and got married.

He said: "They just went off and got married and I don't know what the deal is. We text Hailey every now and then. We met him one time." 

It was later speculated that because both Hailey and Justin are religious, they don't consider their marriage official yet because they haven't had a full ceremony in a church.

The couple are planning to make their marriage meaningful in the eyes of God through a second, formal wedding in a church in the near future.

Meanwhile, Hailey recently claimed her engagement was the "most adventurous thing" she's ever done.

She said: "My entire summer has been quite adventurous in life in general. I've been travelling all over. For me, being adventurous is flying by the seat of my pants, which isn't something I'm normally comfortable with, but I've been doing it for the last few months. Just travelling, and it's so fun to be able to pick up and do things. 

"Well, I got engaged! I think that's probably the biggest OMG moment of the year for me, of my life. So that's probably top."