The news comes as the former Lizzie McGuire star has already picked out a moniker for her impending arrival. Picture: AP

Hilary Duff has been saving clothes for her unborn daughter “for 10 years”.

The Younger star is due to give birth to her little girl, whom she's expecting with her boyfriend Matthew Koma, later this year, and has said that she’s been planning ahead for a decade, as she has a box of clothes and accessories for the tot which she’s been saving over the years.

She said: “Oh, I’ve been [saving clothing] for like 10 years! And I’ve been doing that having no idea I was going to have a girl. I think I knew at some point I was going to have a girl and just saved a lot of cool stuff.”

The 30-year-old actress - who already has six-year-old son Luca from her marriage to Mike Comrie - has a designer bib ready for her daughter, as well as bigger items of clothing that she will hand over in another 10 years.

She added to People magazine: “I have this really cool Dries van Noten pearl bib thing that I bought a couple years ago. [It’s] things like that that I probably spent too much money on but I really enjoyed, and maybe I am not enjoying right now, but I think that in 10 years it will be cool for her.”

The news comes as the former Lizzie McGuire star has already picked out a moniker for her impending arrival, and although she won’t share the name, she has hinted it will start with the letter B.

She said: "It was the very first thing [we decided on. We've known her name for a really long time. Her name starts with a B, and I keep calling her baby B, which is awesome because people are like, 'Oh, no, it's just because of his last name.'"