Only a week ago You Tube and TV was lit up with Sarah Silverman singing that she's "f*cking Matt Damon" .. This week reports that Jimmy Kimmel ready for a comedic response..

According to the NY POST: 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..

Silverman and Kimmel.. the funniest couple of the 21st century?