Backstreet Boys singer Brian Littrell is embroiled in a bitter legal battle with a neighbor he claims has “set out to antagonize, bully, and harass” his family by trespassing on his $3.8 million Florida panhandle beachfront property and secretly recording videos, court papers allege.

Littrell, 50, filed suit against Carolyn Barrington Hill, 67, on Sept. 19 accusing her of repeatedly coming onto his Santa Rosa Beach oceanfront property from April through September, despite the fact he’s “put up several ‘No Trespassing’ signs, along with chairs, umbrellas, and small tables delineating” his property line, according to the Walton County Circuit Court lawsuit.

Hill — who described herself in court papers as “semi-retired” and “on Medicare” — is accused of “shouting and cursing at [the Littr

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