Prince Harry Rolling and Recording with James Corden in Hollywood

Prince Harry‘s left his quiet home in Montecito to spend some QT with his pal James Corden … but this bro hang is all about work, instead of play.

We got this vid of the famous mates chilling on an open-air double-decker tour bus Friday in Hollywood — and they were rolling pretty deep. As they pulled out of the CBS lot around noon, they were surrounded by a full crew, including 3 cameras and also got a police escort!

No word what they were shooting, but it has all the makings of a pretty epic Carpool Karaoke … especially because Harry’s not exactly known for his pipes.

James and Harry have been tight for years — the ‘Late Late Show’ host attended Harry and Meghan‘s wedding. It is February Sweeps, so looks like James is pulling out the big guns for ratings.

Of course, Harry & Meghan left the big city last year when they spent $14 mil on a mansion up in Montecito — but good to see he’ll fight through SoCal traffic to help a friend in need.