Last night's epic takeover of Jimmy Kimmel Live! by jilted guest Matt Damon was so chock-full of celebrity guests that it should come as no surprise the star-studded skit took nearly a decade to come to fruition.
Fresh from receiving his star on the Hollywood Walk of Fame Friday morning, the host with the most gave ET's Brooke Anderson the inside scoop into Damon's invasion.
"I think we've been planning it for like nine and a half years," reveals Kimmel of his much talked-about Thursday show. "It took a long time."
Like most things at JKL!, he says, the takeover itself (featuring Ben Affleck, Jennifer Lopez, Nicole Kidman, Demi Moore, Robert De Niro, Andy Garcia and Sheryl Crow) fell into place mere hours before taping began.