Despite Ryan O'Neal publicly proclaiming that his prostate cancer was treatable, RadarOnline.com has exclusively learned that his prognosis is 'very grim.'

As RadarOnline.com previously reported, Farrah Fawcett's ex, 70, revealed that he has prostate cancer.

When four-year-old Alexandria Hauser was diagnosed with stage 4 cancer on Thanksgiving Day it affected everyone in her life, but her mom exclusively tells RadarOnline.com it's her “babygirl's positivity” that's keeping everyone strong.

Katie Hauser, a single mother of two from Long Beach, California, explains the chemotherapy, surgery, head shaving and so on that her daughter has already endured -- and what the future holds for them.

"Alexandria was diagnosed with stage 4 cancer on Thanksgiving Day. We were told it 'seemed like' a Wilms' tumor, which is one of the most common cancers for children; kidney cancer. After many tests the diagnosis was confirmed," Katie told RadarOnline.com.

PHOTOS: Celebs Stand Up To Cancer