SURE, Sarah Silverman bragged about sleeping with Matt Damon, but where’s the love for Ben Affleck? Last week, Silverman surprised her boyfriend, Jimmy Kimmel, on his show with a music video called “I’m [Bleep]ing Matt Damon,” featuring Silverman and the “Bourne Identity” star singing together about their faux affair. Now Kimmel is striking back with a song called “I’m [bleep]ing Ben Affleck.” Our source told us the video for this song, set to the theme of “We Are the World,” will star Affleck, Robin Williams, Don Cheadle, Harrison Ford, Ashlee Simpson and Pete Wentz.