Hilary Duff's new song Mature is based on a "brief experience" with an ex

She told Vogue: "It is definitely about a brief experience that I had in my [life] - a long, long time ago. It is not totally autobiographical. I took a few artistic liberties just to make the song work structurally, but the gist is the gist.

"I was looking back on this relationship and thinking about whether this guy had a habit of dating younger women or whether I was 'special'. The whole experience was super therapeutic to write about, but being so vulnerable through your music can be really scary.

"Mature is a conversation with my younger self about being happy with where I landed. Part of it was an idea that Matt originated... Matt obviously knows all the stories from my past, and he's so great at coming up with a concept where I get to go in and interior design the whole thing. The song is about reflecting on your past and coming to terms with the choices you've made, but without being too hard on yourself. It's a fun record, but it's secretly kinda heavy too."

And, Hilary - who has son Luca with first husband Mike Comrie - revealed she never thought about getting married again until she met Matthew.

She said: "He's just the best f****** human and my number-one cheerleader. He believes in me beyond any vision I have for myself. I couldn't imagine making new music with anyone else. I never thought I wanted to get married again until I met him. We had Banks before we got married, and while I was pregnant I kinda hated his guts. I couldn't stand the way he walked and chewed because all of this stuff was just so terrifying. Every day I looked in the mirror like, Oh my God, what am I doing? Then we had the baby and I saw what a great dad he is. I was like, Wait, I'm actually obsessed with you!"