The Backstreet Boys star was booked by Monroe County Sheriff's Office on 13 January (16) after a brawl broke out outside the Hog's Breath Saloon in Key West.

"I am human and at times it can be a struggle to balance a healthy lifestyle. I'm not perfect and for that I am sorry," Carter wrote in a post on the social media site on Saturday (23Jan16).

Reports suggest the singer and a friend allegedly became embroiled in a bust-up with security guards outside the bar after they were asked to leave the venue.

Carter was released the day after his arrest (14Jan16), and appeared in court on to face a charge of misdemeanour battery. Outside the court, he told reporters that "The truth will come out".

"I'm just a guy trying to enjoy some vacation time in Key West. The truth will come out," he announced.