Hilary Duff thinks her career may have peaked.

The 27-year-old musician and actress - who has three-year-old son Luca with her ex-husband MIKE COMRIE - has admitted taking time out from her career to start a family means it may never again scale the heights it once did.

She said: ''Trying to penetrate the music world takes all your time - you have to hit every radio station, or they won't play your single, unless you're, like, Taylor Swift.

''That was when I realised that I really care about being an actress, a singer and having a life outside of both. So maybe that means I'm not going to be able to be where I was. I'm not going to be able to fight for being the biggest artist.''

Meanwhile, Hilary also confessed her ex-husband must find it ''hard'' to listen to her music.

Hilary, who split from her husband in January last year, revealed her new album 'Breathe In. Breathe Out.' was inspired by their failed relationship.

She said: ''I'm sure it was hard for him to listen to some of the things I'm sharing about him.

''But that's my job. I'm an artist. He knew that when he married me.''