When a viral video gets almost 40 million views on YouTube, it's only a matter of time until its creators end up on "The Ellen DeGeneres Show."

Yep, we're talking about "What Does the Fox Say?"

Norwegian brothers Bard and Vegard Yivisaker (AKA "Ylvis") are the hilarious brothers behind what is one of the most ridiculous music videos ever -- and today, they make their first U.S. television appearance on Ellen's show.

But wait, it gets better.

Not only do they perform their totally crazy (but incredibly catchy) song, but Ellen performs it with them!

Enough reading, just watch it above! 

And if you haven't seen the original clip, you MUST WATCH it below:

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