Kim Kardashian got some tough news on Friday - Mercy, the white kitten given to her by boyfriend Kane West, has passed away.

The 32-year-old reality star took to her personal blog to share the news with fans and express her grief over losing the beloved pet.

"It is with deep sadness that I have to tell you all that my kitten, Mercy, has passed away. My heart is completely broken," Kardashian wrote.

Kim named the kitten after "Mercy," the song by her rapper boyfriend that also featured Big Sean and Pusha T and appeared on the G.O.O.D. Music album "Cruel Summer." She wrote on her blog that after spending time with the cat, she quickly discovered that she was allergic, and several doctors told her the only solution was injections, which she didn't feel was safe.

Because she wanted the cat to have the best life possible, Kardashian gave Mercy to her sister Khloe Kardashian's assistant, Sydney Hitchcock, who had recently lost her beloved cat of 17 years. Things were all perfect for a while, until Hitchcock got some very bad news.

"Sydney gave Mercy a loving home, but after a couple of weeks Mercy got really sick and Sydney had to rush her to the vet," Kim wrote. "They discovered she had a stomach problem that we weren't aware of. Her stomach had filled with fluid and the doctor said she had a rare stomach cancer and that there was nothing we could do for her. Poor little Mercy died the very next day. It broke not only my heart that little Mercy died at only four months old, but Sydney's too."

Kardashian ended the blog post by thanking Hitchcock for the love and care she gave the kitten during her short life.

"Mercy was a gentle and loving kitten and we are all going to miss her so much," Kardashian wrote. "Thanks to Sydney for making Mercy's short life one filled with love. RIP Mercy Xo."

Tags: Kim Kardashian Kanye West Mercy