The "All of Me" singer released a modern version of the Christmas classic featuring Kelly Clarkson.
Ferrell told Jimmy Fallon that Walken is constantly bombarded with calls for "More cowbell!"
The "Late Night" host went day drinking with the pop star earlier in the year and found there's something she's not good at.
The singer thinks he should have tried harder.
The "Riverdale" star let Jimmy Fallon read her quotes ― for better or worse.
Trevor Noah, Jimmy Fallon, Samantha Bee, Seth Meyers, Stephen Colbert, James Corden, Jimmy Kimmel and Conan O'Brien all chimed in.
Of course the actor's duet with "The Tonight Show" host Jimmy Fallon ended with "Let It Go."
Fans thought they finally had the answers, but now they've been served a new plot twist.
The Oscar winner couldn't get "The Tonight Show" host out of his University of Texas film class fast enough.
“Basically, for $18, you get to read his father’s Twitter account."
The "Uncut Gems" actor told Jimmy Fallon he made the "weirdest" discovery using a prop off the set.
The actors played "Know Your Bro" with Jimmy Fallon and viewers got to know too much.
The "Stranger Things" and "Charlie's Angels" stars played Virtual Reality Pictionary with the late night host.
The actor gave fans the answers they deserve on "The Tonight Show" with Jimmy Fallon.
In a recently unearthed 1999 interview, the actor admitted she wasn't a fan of the boy band.
"The Tonight Show" host even recalled his own worst effort from childhood.
The "Dolemite Is My Name" actor does quite a Bob Marley in the random challenge.
The late night TV rivals have more in common than they thought.
“He’s pretty good, but probably not quite as good as he thinks he is,” the actor told Jimmy Fallon.
Jimmy Fallon dug up an old video of Biel, which her husband, Justin Timberlake, might not be too happy about.