Parents

See why Robert Downey Jr.'s cute gesture for ill fan went beyond a tiger costume

That roar you're hearing isn't Robert Downey Jr., who posted an Instagram photo of himself in a tiger costume Friday; it's the sound of fans who are cheering his gestures for a young fan with cystic fibrosis.

The "Iron Man" star's photo-sharing account posted the picture in response to a 7-year-old fan named Daniel, who has cystic fibrosis, had been bullied because of it, and considers Downey his idol, according to the boy's mother, Vicky Keyte.

"[Daniel] wants nothing more to meet his idol Robert Downey Jr (aka iron man) as he has managed to get past the bullies he faces from day to day by telling them the he too has a extra special port in his chest much like iron man has his arc reactor," reads Kayte's caption to a photo of Daniel that she posted last week. "I am sharing this in hope that mr stark (as Daniel calls him out of the suit) could find a way to contact me on here as Daniel could really do with a little lift at the moment after a child at school has told him that all children with cf die. If this reaches him and Daniel could get a reply I hope that it could help him through his stay in hospital as it is starting to take its toll on him."

Downey, 50, provided his adorable reply just a few days later.

"Mr. Stark here," reads the caption to Downey's amusing image, which shows him clawing toward the camera and sporting a pair of aviator sunglasses with his head-to-toe animal print. "This is for Daniel … who was having a rough day recently. When I’m in the dumps, I’ve found this little getup to be helpful."

But getting dressed up in a goofy costume in honor of a big fan wasn't all the movie star offered the young fan. "P.S. Would you like to come to the LA premiere of Captain America: Civil War as my guest?" asked Downey, referring to the next "Avengers" sequel, slated for a May theatrical release. "If so, have your people call my people. All the best."

The mom was stunned by the response — calling herself "a blubbering wreck" — thanked the actor, and took him up on his offer in a follow-up Instagram post Saturday.

"I will keep everyone updated on the build up to the big day on Daniels progress and his day to day going ons and of course his tuxedo fitting that he has asked for today as he wants to fit in like a real star (not that he is not the biggest star in my eyes)," Kayte wrote. "Thank you everyone this is by far the best wake up call ever."

Later that day, she posted a video that shows Daniel roaring with approval of his own.

"I think," she wrote in the caption, "someone might be a little excited."

Follow TODAY.com writer Chris Serico on Twitter.

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