Depp had just left a recording studio in Los Angeles when his friend, Babybird star Stephen Jones, was threatened by a man with a broken bottle, The Sun reports.
"It was an extremely scary moment," a source said. "This guy looked off his head. Johnny looked him straight in the eyes and told him to back off."
However, the mugger allegedly backed down after Depp intervened.
"The guy was OK," the insider continued. "He looked at Johnny and said, 'I ain't stealing from Captain Jack' and put the bottle down. Johnny gave him a few bucks and told him to straighten up his life."
Depp had reportedly been recording a guitar solo for a new Babybird song before leaving the studio.
