In case you've been living under a rock - and I don't think any readers of this blog are - Jimmy memorably declared "I'm (bleeping) Ben Affleck" in a music video Sunday night that Ben agreed to appear in - in an extremely tight shirt!

"Ben could not have been more sporting," Jimmy told PEOPLE of his video costar. (The song was designed as a retaliation against Kimmel's girlfriend Sarah Silverman for her clip, "I'm (bleeping) Matt Damon.) "He told us, 'Listen, if we’re going to do this, we’ve got to do it right. I don’t want you guys to worry about my image.' "

In the video, Ben and Jimmy declare their love while backed by an A-list gospel choir including Cameron Diaz, Robin Williams, Ashlee Simpson and Don Cheadle. There are also non-singing cameos by Brad Pitt and Harrison Ford, who blows the new couple a kiss before driving off in his convertible – revealing a "Honk if you're f---ing Ben Affleck" bumper sticker.

"That was his real car," Kimmel says of Ford. "He's still got that [sticker] on there!"

So what did Silverman think of the new song? "I suspected Jimmy was on the down low for a long time now," she deadpanned to the New York Daily News. "I wish I could say I was surprised by this."

Here is a LINK to the video...