India, March 11 -- Singer and actress Hilary Duff has revealed that her emotional new song We Don't Talk is about her strained relationship with her sister, Haylie Duff. The song appears on Duff's new album Luck. or Something, which was released on Friday.

Fans had been speculating that the song was about her sister and Duff has now confirmed it during an interview with Anthony Mason on CBS Mornings.

"It's definitely about my sister. And just absolutely the most lonely part of my existence is not having my sister in my life at the moment," Duff admitted.

She also said it was difficult for her to decide whether to include such a personal song on the album.

"I really struggled with thinking about including that on the record. But it's f...