United Kingdom, Feb. 20 -- Hilary Duff worries her husband will leave her for a "coolio indie songwriter".

The 38-year-old singer is happily married to Matthew Koma - with whom she has daughters Banks, seven, Mae, four, and 21-month-old Townes - but she has regular dreams about him being unfaithful to her, a topic she explores in her new song Holiday Party.

Hilary - who also has 13-year-old Luca with first husband Mike Comrie - told Rolling Stone magazine: "I always think Matt's going to leave me for some coolio indie songwriter that he works with."

Matthew replied: "Which is so insane. But also very real. Those are real things to get hung up on emotionally."

Hilary's highly-anticipated new album, Luck... or Something, features deeply...