... and admitted he took a swing at team-mate Kieron Dyer during the match against Aston Villa in April last year. He has been fined £600 and ordered to pay £1,000 costs.
The 29-year-old, now with West Ham, pleaded guilty at Newcastle magistrates court to using threatening behaviour after the pair were involved in an on-field brawl at St James' Park.
The former England international was given a four-match ban by the Football Association, who then gave Bowyer a further three games and a £30,000 fine.
Bowyer was also fined six weeks wages by the club - thought to be in the region of £200,000 - although Dyer was not fined as Bowyer was alleged to have thrown the first punch.
Bowyer's solicitor Steven Barker said: "Lee has today pleaded guilty to an offence under Section 5 of the Public Order Act 1986. He was previously charged with a much more serious offence under Section 4 of the same Act but contested that charge. As a result the Crown and Prosecution Service sensibly dropped this charge and accepted Lee's offer of a plea.
"Lee offered the plea of his own volition so as to avoid what would have been a four-day trial involving a number of witnesses including his fellow professionals. He did not wish to bring the spotlight upon his fellow professionals for an incident which occurred over a year ago.
"The incident was blown out of all proportion. Far more serious incidents occur almost weekly in sport and go unpunished. Lee had already apologised for his action on that day as well as apologising personally to Kieron Dyer. He remains a friend of Kieron.
"He received a very substantial penalty from his employers at the time, Newcastle United FC, and subsequently a further penalty and fine from the Football Association. The total monetary fine was in excess of £250,000, excluding legal costs.
"Lee is looking forward to the new season with West Ham. He wishes to thank everyone at the club as well as his former colleagues at Newcastle and indeed Gordon Taylor and the Professional Footballers Association for their support in this case."