Khloe Kardashian does not skimp on the sisterly love.
The Good American co-founder honored sister Kim Kardashian on her 42nd birthday with a letter that highlighted who Kim is in Khloe's eyes.
"My brave, remarkably resilient sister, happy birthday!" Khloe wrote in an Oct. 21 Instagram post. "Life doesn't get easier or more forgiving we simply become more resilient and, in my opinion, you are the poster child of resilience."
Khloe went on to add that the SKIMS mogul has become "stronger, wiser, braver, more vocal with your beliefs" over time—something that Khloe believes is rare.
"You have managed to become kinder and gentler the more years that have gone by," she wrote. "I thought people got grumpier the older that they became, but you have become a more self-aware, loving and patient person. The busier you become, the more you give to the ones you love."
The 38-year-old wrapped her touching message with a promise that she would do anything for Kim. And let it known that Khloe's ride-or-die mentality goes without hesitation.
"I would do ANYTHING for you. Absolutely ANYTHING," Khloe wrote. "I won't even ask questions. Ha! I'll follow you blindly wherever you go to support and protect you."
She added, "Never forget that I'm by your side in all lifetimes. I've already worked it out with the angels."
Khloe paired the touching message with a few throwback photos from over the years, and (in true Khloe fashion) she comically finished the Instagram carousel off with a clip of Kim's infamous "Don't be f--king rude" episode from season two of E!'s Keeping Up With the Kardashians.
Khloe wasn't the only one to pay homage to Kim's personality in their birthday tribute. Corey Gamble took to his own Instagram page on Oct. 21 to write, "To my magical strong minded & Brave Heart Lawyer ! @kimkardashian Happiest Happy Birffffday."