Is Pete Doherty back on crack? It’s a possibility. The former Mr. Kate Moss has sparked speculation that he has returned to his drug-infested past after singing the banned Nazi verse of The National Anthem at a German music festival last weekend.

The rocker took to the stage at the Munich event, organized by radio station Bayerischer Rundfunk, on Saturday and launched into a rendition of “Deutschlandlied” – loosely translated “The Song of Germany.”

Only the third verse of the national anthem is allowed to be sung in Germany. The first stanza of the anthem translates as: “Germany, Germany above all / Above all in the world. When, for protection and defence, it always takes a brotherly stand together. / From the Meuse to the Memel, From the Adige to the Belt, Germany, Germany above everything. Above everything in the world.”

As soon as fans heard those words — which has been banned since the end of World War II because of its use during the Nazi regime by Adolf Hitler and its reference to racial superiority – they began to heckling Pete.

His performance was allowed to continue for five more songs before organiszers made him leave the stage– prompting Pete to hurl his microphone at the concert’s host.

How mature.