The 31-year-old "Cure" hitmaker took to her Instagram account to post a heartfelt tribute to her former assistant Sonja Durham, who she wrote her bonus track "Grigio Girls" on her album "Joanne" for, after learning she had lost her long battle.
Alongside a photograph of her friend, she wrote, "Watching one of my best friends in the world show unfathomable courage, strength, and positivity while battling cancer has really changed my life. Thank you Sonja for inspiring me and all of us everyday with your joy.
"And you and Andre, your unbreakable beautiful love is what life is all about. You can see it in this photo. Wanted to share this with the world and show them what true beauty looks like. #grigiogirls #sonjadurham @sonjad7777 I love you girl. I love you so much. (sic)''
This isn't the first time the 31-year-old singer has honoured her friend - she dedicated an acoustic version of "Edge of Glory" to Sonja, who was battling stage IV cancer, during her headlining slot at Coachella Valley Music and Arts Festival in April.