You can listen to the 2-part interview here and here (it will launch a player). The second part contains the swearing.
The news is reporting the confusing issue of swearing - does Hilary condone or endorse it? They ask Hilary Duff what her favorite swear word is:
"I guess, sometimes a good fuck, like just saying fuck, makes you feel pretty good, you know?
It's such not a nice word at all. Like, really, like sometimes I'll not know somebody and they'll walk by, and they’ll be a really pretty girl, and I'll be like, 'Yuck! That’s not attractive.'
But really, nothing else makes you feels that good, like letting a good one out, you know?"
LOL this is all so ridiculous, i just had to post it!