Justin Bieber -- He's a Kippah!

10/4/2010 2:40 PM PDT BY TMZ STAFF
Justin Bieber threw on his finest yarmulke and went to the wedding of his musical director in Toronto over the weekend.

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Oy, he looks so skinny. He should really eat something.

100110_bieber_video4UPDATE: Bieber also joined forces with the groom (who played guitar) to rock "Baby" for crowd ... it's definitely worth a watch.