This is the moment a lucky fan got to rap for Hollywood star Chris Pratt at the premiere of "Avengers: Endgame" in Los Angeles on Monday, April 22.

Peyton, who suffers from Idiopathic Generalized Epilepsy, got to attend the glitzy event thanks to the Make-A-Wish charity.

Peyton is a big fan of Pratt's viral series "What's My Snack?" so when she got to meet him, she performed one of his rhymes about a carrot cake muffin.

"I love that you know that! That's soo good," Pratt said.

Lisa, Peyton's mother told Newsflare: "After every seizure, the disappointment is so massive that as a family we use humour to redirect our focus. Peyton has specific go to pick me ups - 'The Office', 'Parks and Rec' and 'What's my Snack?'

"To be able to meet the people that are a huge part of your healing is simply incredible and surreal!"

Peyton's incredible night didn't end there: next she met Chris Evans who agreed to sign her arm with the words "I can do this all day," a quote from his film "Captain America."

Lisa also told Newsflare: "We were witnessing an actual dream coming true for our daughter! He could not have been more gracious and personable to our sweet Peyton!"

The quote has been her mantra during her darkest moments since being diagnosed with Idiopathic Generalized Epilepsy," Peyton's mother said.

"She plans on having the quote tattooed exactly as he wrote it on her arm," she added.

Chris Pratt and Chris Evans both star in the new "Avengers: Endgame" movie which has earned an estimated $1.2bn on its opening weekend at the box office, putting it on course to be the highest grossing film ever.