Gaga's producer DJ Whiteshadow posted the new track online

A new Lady Gaga track has emerged online.

The hip-hop track, which features Gaga rapping, was posted by her current producer DJ Whiteshadow. But it is not yet clear whether it will feature on her forthcoming new LP ‘ARTPOP’, which is due in 2013.

Earlier this week, Gaga courted controversy by smoking cannabis onstage during her Amsterdam show – part of her ‘Born This Way’ world tour – praising “wondrous marijuana” after getting the joint from a crowd member.

“I want you to know it has totally changed my life and I’ve really cut down on drinking. It has been a totally spiritual experience for me with my music,” she told the crowd.

Lady Gaga recently completed the tour’s British leg with a pair of dates at Twickenham Stadium on September 8 and 9 and a third show at Manchester Arena on September 11.

She will return to the UK to make a public appearance at iconic London department store Harrods on October 7. She has also announced that she will make her acting debut in a new Robert Rodriguez movie called Machete Kills, playing a character called La Chameleon in the film, which is a sequel to Rodriguez’s 2010 action exploitation movie Machete.