Celebrity trainer Gunnar Peterson reveals his 4-year-old daughter is battling leukemia

It must be absolutely devastating when a parent learns that their small child is battling leukemia.

It may be even tougher if you're a celebrity who's every move is in the spotlight and being judged by the public.

That's the exact situation that celebrity fitness trainer Gunnar Peterson finds himself in right now.

He recently took to social media to share a photo of his age 4 daughter resting in a hospital bed, revealing that she is battling for her life after having been diagnosed with leukemia.

"This is going to be longer, and cathartically different from my usual fare. Forewarned is forewarned. Life changing turn. Our perfect 4 year old daughter, Monroe Vivian Peterson (MVP, see that?!) had a nagging cough, on and off fever, and an odd pallor to her for a few days last week. Typical kid stuff," Peterson said. "Then my wife noticed bruising on her legs which was odd since she hadn't been very active because of the other symptoms, and she took her to the hospital." He added:

Fast forward 4 days: White blood cell count KO'd. Platelets in the toilet. Hemoglobin number lower than a soccer game final. Hematocrit front row on the struggle bus. Needs immediate transfusion(s). Has to have bone marrow biopsy. Flow cytometry. Spinal tap(s). Chemotherapy. And finally, Make-A-Wish candidate. She has AML leukemia. How the f*#! did we get here?!?!

"More to come as we navigate the nightmare… Our Warrior Princess will crush this! She has even said it herself!" he continued. "Please hold our daughter, and our family-immediate and extended-in your hearts, thoughts, and prayers. As we are all aware; 'you never know what someone is going through. Back to levity and fitness fodder, more on this as it unfolds," he concluded. "Into the storm."