Ireland Baldwin thinks her cousin Hailey Baldwin and fiance Justin Bieber's engagement was a "long time coming."

Ireland Baldwin

Ireland Baldwin

The loved-up couple may have raised eyebrows when they announced they were heading the altar back in July following year of on/off dating, but the 21-year-old model's cousin - the daughter of Alec Baldwin and Kim Basinger - wasn't surprised by their engagement as they're so in love.

Speaking to 'Entertainment Tonight', the 22-year-old fashion model said: "It was meant to be a long time ago. It was just a long time coming, and we're all like, 'Alright, thank god, let's move forward.' They're so in love and they really do a lot of good for each other, and that's the most important thing for me, that he makes her so happy. They just bring out the good in each other, they really do. I think they do a really good job of checking each other when one desperately needs to be checked and told, 'You're out of line.' I think they really, really do care about each other so much and care about what others and what their families think of them."

The couple were rumoured to have already got hitched, but Ireland think they want to take their engagement "slow."

She explained: "I have no idea what their situation is. I think they're just taking things slow. They're just kissing all over the world. They're just kissing and loving and having fun, and I think people take little details and get too caught up in them, and they're looking too hard. Just let them kiss!"

However, the blonde beauty does think her cousin Hailey will opt for a small ceremony when she does eventually tie the knot because she prefers "intimate" occasions.

Justin, 24, proposed to Hailey two months ago during a romantic getaway to the Caribbean.