Katy Perry Mourns Loss Of Beloved Friend & Music Exec 'Geli' Cob-Baehler

"She was one of the strongest women I have ever known - fighting her cancer like friggin' Rocky, enduring chemo, immunotherapy, a tracheotomy, feeding tubes for months on end, and experimental cancer treatment trials. I watched her go through many stages for over a year, but a few things remained constant: her sarcastic/wicked sense of humor, her positive outlook, and the incredible love she had for her family," the "Roar" singer continued.

Perry added that if it weren't for her BFF's help, she wouldn't be the star she is now, as she gave her the strength to go on and believe in herself.

"We had a lot of wins together for over 10 years, and I am incredibly grateful she was a born fighter/no shit-taker because she practically willed me into existence as a young artist when she "stole my files" from limbo at Columbia Records and brought them to life at Capitol Records," explained Perry.

Other than helping her in her career, Cob-Baehler was one of her closest friends, so much so that she felt like a sibling.

"She was like a big sister to me, showing me the ropes and always having my back. She never became a yes-person and was quick to check me when I needed checking - that was family. I have procrastinated posting this because it makes it feel a little too final, but I don't believe people ever really die - she just had to leave that body behind. Out of body, and full of spirit now," added Perry.

The star went on to say that unfortunately, Cob-Baehler left behind a beautiful family, including two young girls and a loving husband who was her "rock" through her entire cancer nightmare.

Regardless, she will always live on in the hearts of those who loved her.

"I'll never let them forget that Angelica embodied the angel in her name, was a woman of incredible integrity and character, a massive giver, and a DOPE human being. I know today is #GivingTuesday, and if you have been a longtime KatyCat and a friend of mine or Geli's, let's honor her by donating to her favorite charity, Generosity.org by clicking the link in bio. She may be gone from this place, but she will never be forgotten. Rest in power, my angel, and don't worry, we got Chapman and the girls. #RIPGeli" wrote Katy Perry.