Photographer Linda Eastman wed the Beatles legend in 1969 and the couple enjoyed a lasting relationship until she lost her battle with breast cancer in 1998, aged 56.
Now, their daughter Stella McCartney has paid tribute to her parents' romance by launching a new fragrance based on the Let It Be hit-maker's nickname for his wife, L.I.L.Y., which was also her favorite flower.
She tells Harper's Bazaar, "I've been hiding away from giving out information but, yes, that was my dad's nickname for my mum, and I always knew I wanted to create a fragrance called Lily. Lily of the valley was a flower my mum loved, and it's also one that I loved."
"I love that it represents spring, I love the way it looks, I love everything about it. It was my wedding bouquet, and it grows in our garden now... I have huge admiration for my mum. I think that I'm keeping alive some of the things she believed in and elaborating on that."
Although Linda passed away nearly 15 years ago, Stella insists she still struggles with her mother's death every day.
Fighting back tears, she added, "I'm not good with death, I'm not going to pretend I am... (It was) definitely the most difficult thing in the world I've ever had to encounter. It's with me every day, the thought of how one deals with all of the repercussions."
"I'm aware that it's part of everything I do, in a good and bad way."