Growing up with sets of famous parents Carrie Fisher and Sean Ono Lennon made logical friends.

"I can honestly say that Carrie was one of the best and closest friends I've ever had in my life. She was the smartest, funniest, kindest, and most generous person I have ever known," he wrote in a post on Instagram after her passing. "My heart is completely and permanently broken. This is the kind of loss that you never recover from. I know because I still miss my dad every single day."

With talent running through their veins Sean Ono Lennon who's parents are Yoko Ono and John Lennon, could relate to the life of Carrie Fisher who was the daughter of Debbie Reynolds and Eddie Fisher.

Last weekend Sean released a demo unmixed of a song they wrote together before her death.

"Carrie and I used to stay up til dawn chatting and pontificating about life. They were my best moments. Anyway... we wrote a song about staying up too late and hearing the birds sing," he posted on Soundcloud.

Willow Smith, daughter of Will and Jada Smith helped to record the song by lending to the vocals.

"Carrie and I wrote this song years ago. When she died I just felt I had to record it. This is only a demo unmixed, we only had a few hours to record it. But the lyrics she wrote with me I think are marvelous," Sean posted on Soundcloud.

Well done!