Madonna has hit back after she was criticised for showing off a picture of her son holding liquor bottles, insisting the teenager was not drinking alcohol.

The Material Girl hitmaker sparked outrage by uploading a photograph of 13-year-old Rocco holding bottles of spirits, with the caption, "The party has just begun! Bring it! 2014."

The pop star received a barrage of messages from her followers accusing her of encouraging underage drinking, but Madonna has hit back by insisting Rocco and his friends didn't actually consume the booze.

In the caption attached to a second picture of her son with a friend, which did not feature bottles of alcohol, Madonna wrote, "No one was drinking we were just having fun! Calm down and get a sense of humour! Don't start the year off with judgement!"