VivaSync

While watching Eminem perform his new single "Berzerk" on Saturday Night Live over the weekend, some folks went a little, well, berserk.

Almost immediately after he took the stage, speculation began to surface that the 41-year-old artist may have been lip-syncing his performance.

However, Slim Shady's rep tells E! News the rapper "was not lip-syncing," saying that Em "doubles his vocals live. Rhymes over a vocal track."

What's more, the rep adds, "He only does it sporadically through the songs. They're accent tracks."

Well, there you have it.

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