LOS ANGELES, April 6 -- Bill Murray made a surprise appearance on The Daily Show yesterday to help Malaysian-born comedian and actor Ronny Chieng celebrate a major milestone: becoming a US citizen.

Chieng was mid-monologue when the legendary actor, comedian, and writer casually strolled on stage from backstage - much to Chieng's shock and the audience's delight.

"Oh, how are you?" Chieng exclaimed, laughing as Murray walked up to shake his hand.

"They said you're very excited today because you just found out you've become an American citizen," Murray said, grinning.

Chieng nodded, calling it "a crazy, crazy day. Thank you, thanks so much."

Murray gave him a kiss on the cheek and a warm hug before saluting as he exited the stage to a ...