Greg Grunberg has a personal reason for raising money for his epilepsy charity, as his son, Jake, was diagnosed with the disorder at age 7. Among those who have helped Grunberg in his efforts over the years is Rick Harrison, who in 2015 joined the actor for his "Talk About It for Epilepsy!" netathon to raise money for the Epilepsy Foundation.

Regarding the Leonardo DiCaprio painting, Grunberg told Harrison during his "Pawn Stars" segment in 2017 that "The Revenant" best actor Oscar winner wasn't the only star he approached to do paintings for his charity. "So the story behind this was, I was raising money for my charity, and I thought, 'Why not ask some people that you don't normally think of artists from Ringo Starr to Mike Love to John Mayer, Bradley Cooper — all these great people — send them a canvas, send them paint, have them paint something, and then I'll try and sell it,'" Grunberg explained to Harrison. "And it worked."

Harrison said he admired DiCaprio for contributing his time and talents to Grunberg's cause. "Leo is a mega-mega-mega star. He painted this for charity, which was a really great thing," Harrison said. "He has a lot of fans out there, so I think I can make some money on it. We'll wait and see."

To date, there is no information available regarding how much Harrison sold the DiCaprio painting for.

The DiCaprio canvas wasn't the last time Harrison mulled over buying a celebrity painting. During Season 19 in 2021 on "Pawn Stars," a Prince painting caused a huge fan debate since there was no way to validate that the late music legend actually worked on the piece.