Dave Gee: Life from Right Field

American late-night talk show host Jimmy Kimmel has upped the ante in his long-running "fued" with Hollywood star Matt Damon. Kimmel often mentioned Kimmel at the end of his show, with a fake apology for "running out of time".

Kimmel's comedian girlfriend Sarah Silverman recently shot a surprise music video for his 40th birthday celebration show, revealing that she was actually "f***ing Matt Damon" ;-)

Now Kimmel has gone one better, shooting his own music video in response, where he admits that's he's "being intimate" with Damon's film star buddy, Ben Affleck.

Drafting in Affleck for the gag is clever enough, but Kimmel has gone a hundred steps better, persuading a star-studded lineup of Hollywood stars and singers to join in a massed "We are the World" style singalong.

Keep a look out for Brad Pitt, Harrison Ford, Cameron Diaz, Joan Jett, Macy Gray, Robin Williams, Pete Wentz, Lance Bass, Huey Lewis, Christina Applegate, Dominic Monaghan, Meatloaf, Josh Groban, and more familiar faces in this clip...