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WATCH: Cubs' Anthony Rizzo, Theo Epstein sing karaoke together

When you sweep the defending champions, it's time to celebrate.

That's exactly what Cubs' Anthony Rizzo and Theo Epstein did over the weekend. A video emerged on Monday of two of the biggest faces of the Cubs franchise engaged in some good clean American fun at a karaoke bar, singing along to AC/DC's "You Shook Me All Night Long."

Watch and enjoy the beauty that is Epstein and Rizzo's singing:

What that glow stick is doing in Epstein's front pocket, nobody will ever know.