Kathryn Hahn Knew About Agatha's Theme Song All Along

It's hard to believe a world without it now, but it's only been a few weeks since the universe was blessed with "Agatha All Along." The short but hilarious theme song sung by WandaVision's witchy villain Agatha Harkness (played by scene-stealer Kathryn Hahn) inspired countless online memes, and became super popular super quickly — but did the show's cast creators know they had a hit gem on their hands? Apparently so! 

In a recent interview with UK news publication The Independent, the How to Lose a Guy in 10 Days and Mrs. Fletcher star opened up about how long she's known about Agatha Harkness' signature bop, and how she was totally down to sing it from the get-go.

"Oh, I knew about it from the beginning," Hahn revealed. "At my first meeting, they were like, 'You’re going to get a theme song.' And I was like, 'I’m in.' And then they were like, 'Are you down with singing it?' It was like, 'Yes.' I had no hesitation; I was so excited. I was a child who grew up with The Munsters and The Addams Family. And it took half an hour; that’s what’s so crazy about it."

Well it looks like Kathryn having no hesitation to sing her own theme song paid off, because the second the 7th episode of WandaVision debuted that featured the track, it instantly became a viral hit, and it even charted on Billboard and iTunes soon after! 

Yup, earlier this month, "Agatha All Along" went #1 on iTunes and easily garnered 1.6 million U.S. streams in its first week on music streaming platforms. Despite the song literally being less than a minute, it made it to #36 on the Billboard Digital Song Sales at the time, making it Kathryn's first-ever entry on a Billboard chart. (Is a music career blossoming for Hahn?!?)

"I don’t understand it, it’s amazing," Hahn told Seth Meyers on Late Night when discussing the song's popularity. "I was, like, 'What?' I don’t have social media so the whole thing was like filtered down through all of this..."

Considering all of the over-the-top, campy goodness we got from her, hopefully, this won't be the last time we'll be seeing Miss Harkness on-screen! 

Stream "Agatha All Along" in the video below for clear skin.