Hawkeye and Mayor of Kingstown star Jeremy Renner posted a selfie from his hospital bed two days after suffering a horrific snow-plowing accident.
The post got more than 2.5 million "likes" in about two hours.
Chris Evans replied to the message: "Tough as nails. Love you buddy."
"Brother u r a superhero to all of us. U will get through this with flying colors. Love and positive energy to u!" Steve Aoki commented on the post.
Isla Fisher wrote: "Whew! I'm so happy you made this post. Sending you so much love and healing energy. We love you.""Speedy recovery," said Heidi Klum.
"Sending all our love, get well soon!!" added Kelly Clarkson.
The Wind River and American Hustle actor was hospitalized in critical but stable condition in an intensive care unit Sunday morning after he suffered blunt chest trauma and orthopedic injuries in the incident near his home on Mt. Rose Highway, about 25 minutes from downtown Reno.
His representative said Monday that he had undergone surgery.