Jessica Simpson Sings Song the Convinced Her to Divorce Nick Lachey  8/3/06

Jessica Simpson listened to the song Let Him Fly repeatedly to comfort her during her divorce from ex-husband Nick Lachey, and the track has become so important to her she has included it on her new album.

At Christmas last year (05) when the couple announced they were separating, Simpson used the Patty Griffin song's lyrics to reassure herself she was doing the right thing.

Simpson claims she was going through "a really rough time" and enjoyed bittersweet times listening to the ballad with her younger sister Ashlee.

She tells MTV News, "We laid there listening to the song and just cried and cried like babies.

"In a lot of ways, my sister really gave me the strength to pull through this really hard time. And it was just laying there and being with her that got me through it.

"I knew everything would be OK. The song is about how sometimes you just have to know when to let something go. And that was that moment. And I had to sing it."