Two country-music superstars — including the hunky hubby of singer Faith Hill — were locked in the pokey after one stole a police horse and the other attacked sheriff's deputies in Buffalo, NY, cops said. Kenny Chesney — who topped the charts with "How Forever Feels" — was arrested late Saturday night after he galloped away with a Mounted Reserve deputy's horse, authorities said. Minutes later, cops slapped the cuffs on Tim McGraw — son of former big-league relief pitcher Tug McGraw and Hill's husband — after he went ballistic on deputies who tried to corral him. McGraw and Chesney were in Buffalo as headline performers of the George Strait Country Music Festival, an all-day concert that attracted about 50,000 to Rich Stadium in nearby Orchard Park, NY. The melee began in the stadium parking lot when Chesney asked the daughter of Capt. James Coyle, who oversees the sheriff's mounted division, if he could briefly mount her dad's horse. She said OK. Instead, he leaped onto the saddle and trotted off — with sheriff's deputies in hot pursuit, demanding in vain that he stop, lawmen said. — New York Post