When Reba McEntire walks out onto the field on Super Bowl Sunday to sing the National Anthem, she’ll have her parents with her in spirit. The country singer has elected to wear very sentimental accessories from each of them — her father’s belt buckle and her mother’s bracelet. While looking at past album covers on the Drew Barrymore Show, Barrymore recommended she wear her National Finals Rodeo belt buckle for her performance at this year’s game. The buckle — featured on McEntire’s 1984 My Kind of Country album — was given to her after she sang “The Star-Spangled Banner” at the rodeo years ago…