Country music star Trace Adkins has checked into rehab for alcohol abuse after an alleged brawl with an impersonator on the Norwegian Pearl.

Adkins, 52, was headlining a seven-day country music cruise for Norwegian Cruise Lines when he reportedly got into a physical fight over karaoke.

The "All-Star Celebrity Apprentice" winner was in a bar aboard the ship Monday when he heard a Trace Adkins impersonator singing karaoke to one of his songs and a fight broke out, according to TMZ.com.

A representative for Adkins confirmed to ABC News in a statement that the singer disembarked after the cruise ship docked in Jamaica and departed for rehab shortly after.

"As he faces these issues head-on, we ask that his family's privacy will be respected."

Adkins had been sober for the past 12 years after completing a previous stint in rehab in 2002. Just last month, the Grammy-nominated singer hosted the American Country Awards on FOX with NASCAR driver Danica Patrick.

On Sunday, the first day of the cruise, Adkins tweeted, "Up here in my suite, overlooking the pools. Behave yourselves."

Adkins was headlining the cruise along with other acts including Montgomery Gentry and Wynonna Judd. The cruise, which has stops planned in Grand Cayman and Mexico, in addition to Jamaica, will continue without Adkins.

Norwegian Cruise Lines did not reply to ABC News' request for comment.