Bruno Mars is showing off his arty side for charity.

The Grammy winner has created a protest sign featuring Angela Davis as part of the Show Me the Signs benefit auction on Artfizz. Mars has promised to match the winning bid.

Pieces have also been donated by David Hockney, Marilyn Minter, Cardi B and Billie Eilish, with all proceeds going to the families of black women who were killed by police.