United Kingdom, April 30 -- Glen Powell has paid tribute to "a loyal and generous friend" after her cancer diagnosis.

The 36-year-old actor has revealed his longtime friend Charlie Hounslow - a makeup artist who has worked on the likes of 'Gladiator II', 'Asteroid City' and 'Mission: Impossible - The Final Reckoning' - is battling stage 4 glioblastoma.

He wrote on his Instagram Story: "Charlie Hounslow is a wonderful human I have the pleasure of working with every day.

"She's a loyal and generous friend with an infectious laugh, and true zest for life.

"Charlie has just been diagnosed with Stage 4 Glioblastoma - an aggressive and currently considered incurable brain cancer.

"Every contribution, big or small, helps get her the care sh...