The X Factor judge, 32, attended a luncheon thrown by the Katie Piper Foundation this week and found meeting Katie very "inspiring".
To accompany Katie's new self help book Things Get Better: If You Believe Then You Will Survive, Katie gave a talk to an audience of celebs and VIPs.
And 'Call My Name' singer Cheryl was clearly moved by the event.
Taking to Instagram the next day, she wrote: "Yesterday was so inspiring at the @katiepiper_ 'It Gets Better' luncheon.
"It was incredibly moving to hear her story being told in such a brave and candid way."
Cheryl continued: "Katie to me is a true survivor and an unbelievably strong woman who uses the horrific ordeal she experienced to better the lives of others #hero."
Bodyshockers presenter Katie has been a tireless campaigner for burns victims ever since she was attacked in 2008.
An aspiring model and TV presenter, she suffered horrific burns in an acid attack ordered by an ex-boyfriend. Since the incident, she has had to undergo ongoing surgery and treatment in order to recover.
Rochelle Humes, pictured with Katie and Cheryl, also thanked Katie for the afternoon.
She tweeted: "Lovely afternoon @KatiePiper_ foundation luncheon, Katie & her team are doing fantastic work, great to be invited."
Absolute inspiring afternoon. Katie you are a hero x https://t.co/fmgOdokcwF— caroline flack (@carolineflack1) September 23, 2015
X Factor host Caroline Flack tweeted Katie, saying: "Absolute inspiring afternoon. Katie you are a hero x."
Dr Dawn Harper, who also attended the event, tweeted: "Amazing speech from @KatiePiper_ 'Life is 10% what happens to you and 90% how you react'. Read her books tweeps. Total inspiration."
Former Made In Chelsea star Caggie Dunlop said she was "excited" to be at the function, while Simon Cowell's wife Lauren Silverman was also present.
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