George Clooney, 61, looked very dapper as he greeted fans at the El Capitan Theatre.
The Hollywood actor sported a two-piece dark blue suit paired with an unbuttoned white shirt, leaving his tie at home.
He accessorised with shiny leather dress shoes, while also showing off his well-groomed appearance.
George arrived at the 20th-anniversary taping of Jimmy Kimmel Live, after appearing on the first-ever episode of the late show alongside Snoop Dogg, NFL star Warren Sapp and musical guest Coldplay in 2003.
He had stopped by Kimmel in 2003 to promote his film Confessions Of A Dangerous Mind, which also starred Sam Rockwell and Julia Roberts.
George Clooney and Amal Clooney have two children together
George Clooney and Amal welcomed their fraternal twins in June 2017, a daughter, Ella, and a son, Alexander. Speaking with The Hollywood Reporter later that fall, George gushed about how fortunate he felt to have found the love of his life. He said: “Every single day of my life, I just feel lucky. Lucky in my career. Lucky enough to have found the perfect partner. Sometimes in life it doesn’t happen on your schedule, but you find the person that you were always supposed to be with. That’s how I feel, and I know that’s how Amal feels.”