Kevin Spacey's impersonation of the late Jimmy Stewart was so good that it brought Carol Burnett to tears on Wednesday's Late Show With Stephen Colbert.

The 82-year-old actress recalled on the CBS late-night program how Stewart, her idol, surprised her by showing up to the finale of The Carol Burnett Show in 1978. Decades later, Colbert had a similar surprise up his sleeve.

WATCH: Ariana Grande Nails Impersonations of Britney Spears and Christina Auguilera

"Well, there's actually somebody here tonight, and you are his idol," Colbert told Burnett, "and it's the actor Kevin Spacey, and he would like to come out and say hi."

Spacey came out and almost immediately started impersonating Stewart, who passed away in 1997 at the age of 89. The 56-year-old even read a poem as the actor once used to do on Johnny Carson's Tonight Show.

The sweet, silly poem brought tears to Burnett's eyes. "The drinks are on me all night at the bar," Spacey, as Stewart, recited as Burnett became emotional, "because Carol Burnett is still comedy's greatest star."

WATCH: Kevin Spacey Auditioned to Be a Tiger Beat Teenage Idol in 1979!

Spacey had another great moment during his appearance on TheLate Show. He revealed to Colbert just who he imagines he's talking to when his House of Cards character, Frank Underwood, turns to the camera.

"Who is that person? Is it like a close confidant," Colbert asked. "Because, the person you're actually talking to, of course, are the people on a 10-hour Netflix binge sucking on box wine."

WATCH: Jake Gyllenhaal Calls Amy Schumer Out on Late Show for Drunkenly Eating His Cake

"I'm talking to one person and one person only," Spacey revealed. "And that is Donald Trump."

"I think he's getting the messages," Colbert responded.

WATCH: 8 Funniest Moments From the 'Real' Stephen Colbert's Late Show Debut

Colbert is off to a great start as the new host of The Late Show. Check out how he gracefully handled a few hecklers in the audience this past week:

Related Gallery

Double Take! Celebrity Look-Alikes