Susan Sarandon enjoys a good spanking

Susan Sarandon made a surprise appearance during the Georgia-based indie band Of Montreal's performance at NYC's Highline Ballroom this week.

Newly-single Sarandon, 63, appeared onstage during their song, "St. Exquisite's Confessions," in which two men dressed as pigs were dancing around. 

She was dressed like a schoolmarm, slapped them both with her ruler, then grabbed one man-swine by the arm, bent him over her knee and spanked him silly.