Chrissy Teigen wants to be ''pregnant for the rest of her life''.

The Sports Illustrated model - who has 18-month-old daughter Luna with her husband John Legend - can't wait to have another child and is keen to ''knock 'em out'' for as long as she can.

She said: ''I feel good, I feel good, we're still trying ... I'm going for I mean hopefully in the next few years because for me I really want to just knock 'em out. That's my dream, I want to just be pregnant kind of for the rest of my life. Not for the rest of my life, but the rest of my fertile life. So we'll see.''

And John has revealed the pair are ''working on'' adding to their family.

He added to E! News: ''We want more, we'll hopefully have another one in the near future. We're working on it.''

It comes after Chrissy admitted she ''cannot wait'' to have a bigger family and loves being a mother to Luna.

She shared: ''I probably think about it more than anybody. I cannot wait to have the biggest family. Everybody is curious. They're like, 'When are you going to do it? When are you going to do it? When's the process going to start?'

''It's so fun absorbing baby Luna right now. I think I'm enjoying my time absorbing and seeing everything - all her new little steps and new moments - and being there for them ...

''Every day it's something new with her. More than anything, I love seeing her little palette. She will eat anything and everything. I just think it's so fascinating. You give her the whisk and she knows exactly what to do the second you teach her. It's really cute.''