AceShowbiz -

Of what can be considered a rare moment, The Rolling Stones' frontman Mick Jagger joined his also-a-singer-brother to sing in front of a small crowd. It happened late last month but the buzz is not high 'till now.

Not so known Chris Jagger was hitting the stage with his Atcha! Blues band when his more famous brother Mick popped his head in the southwest London pub named Bull's Head. Upon taking a break, Chris who noticed his brother's arrival persuaded him to take the stage.

''At first he didn't really want to do it, but I said to him: 'You've got a tour coming up. I think you need the practice','' Chris said. And thus they shared a microphone singing to Stones' "Dead Flowers" with around 40 people in audience seat.

In fact Chris has kept his hope high that Mick would one day join him on stage. The duet wouldn't have happened hadn't Mick visited estranged wife Jerry Hall and their children in Richmond.

An audience captured the moment on ragged cell phone footage below.