In a surprise appearance last night, Sean Lennon -- son of the famed Beatles frontman John Lennon -- dropped by "Occupy Wall Street" and performed Madonna's "Material Girl" for the protesters camping in Zuccotti Park. He was reportedly joined by songwriter Rufus Wainwright.

Video of the impromptu show is below, as published to YouTube on Sunday, Oct. 23, 2011.

Photo: A portrait of Sean Lennon, taken from