Take That stars duet on Robbie's new album track Shame
Working on the number has been the first time the pair have treamed up since Robbie left Take That 15 years ago.
The song is about how Robbie and Gary are mates again, hinting at their previous rivalry.
The video alludes to hit movie Brokeback Mountain, which has the main male characters falling in love.
Robbie, 36, and Gary, 39, appear topless on a cliff ready to dive into the depths below only to chicken out at the last minute.
Gary reformed Take That in 2005 without Robbie, but now the fab five are reunited and have written and recorded a new album for release later this year with a 2011 tour in the pipeline.
Shame, released in October, is the first single from Robbie‘s forthcoming double CD album In And Out Of Consciousness: The Greatest Hits 1990-2010.