A rare Banksy artwork, hand-painted by the elusive street artist and owned by U.S. musician Mark Hoppus, heads to auction on Tuesday with a price estimate of up to $6.35 million. "Crude Oil (Vettriano)" is Banksy's re-imagining of the 1992 painting "The Singing Butler" by Scottish artist Jack Vettriano,

A rare Banksy painting with a sharp environmental message is set to go under the hammer at Sotheby’s in London. Crude Oil (Vettriano), a reworking of Jack Vettriano’s The Singing Butler, is expected to fetch up to $6.

The pop-punk musician is auctioning off Bansky's 2005 painting "Crude Oil (Vettriano)" and plans to donate a portion of the proceeds to Los Angeles charities

Crude Oil (Vettriano) is Banksy's reimagining of 1992 painting The Singing Butler by Scottish artist Jack Vettriano, who died on Monday A rare Banksy artwork, hand-painted by the elusive street artist and owned by American musician Mark Hoppus,