“Saturday Night Live” reached peak Christmas this weekend with a final number that would have made even Santa Claus blush.

Musical guest Bruce Springsteen and the E Street Band closed out the final “SNL” episode of 2015 with a rocking rendition of the Christmas classic “Santa Claus Is Comin’ to Town.”

The Boss, who hasn’t appeared on “SNL” since 2002, was joined by the hosts, Amy Poehler and Tina Fey, and the show’s cast — as well as surprise guest Paul McCartney, who put his talents to good use with some sleigh bells.

Cast member Bobby Moynihan shared this selife on Twitter, featuring Springsteen, McCartney and some “SNL” jokesters in the midst of the Yuletide celebration.

Watch Springsteen and the E Street Band’s earlier performance of “Meet Me in the City” and “The Ties That Bind” below.

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