'Fight Song' Singer Rachel Platten Sends Special Message to Cancer-Stricken 10-Year-Old

Rachel Platten, the artist inspiring thousands with her hit song "Fight Song," has a special message for a 10-year-old Missouri girl fighting stage 4 kidney cancer that has spread to her lungs.

"Hi Camille. This is Rachel," Platten, 34, told Camille Clark in a video shared with ABC News.

"I hear that you're going through some pretty tough stuff but I know that you're strong," she said. "You have a lot of loved ones and a lot of support around you, including me now. I love you so much. Keep kicking butt."

Platten first heard about Camille's battle through social media, where Camille's family and friends have rallied with the hashtag #camillemeetsrachel to get Platten to come to Missouri to sing for her biggest fan.

Camille, a rising fourth-grader, was diagnosed with cancer in April after doctors found a nine-pound tumor that was crushing her kidney, according to her mom, Jessica Trapasso.

Camille had surgery last month to remove both the tumor and her kidney, according to Trapasso, and this week began the first of 15 sets of radiation, in addition to chemotherapy.

"It keeps her going," Trapasso said of the song, whose inspiring lyrics include, "And I don't really care if nobody else believesâ€¦'Cause I've still got a lot of fight left in me."