So, who exactly is Justin Bieber's No. 1 fan?

Well, given these new promos for this weekend's Saturday Night Live, it's none other than Kenan Thompson, who is obviously pretty excited about the singer serving as both host and musical guest.

Although the enthusiasm displayed here is a wee bit disconcerting.

Or, to quote the Biebs himself: "That's so creepy."

Check out the clips and see what he means!

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