Carrie Underwood officially joined the membership of the Country Music Association at a CMA-sponsored luncheon during Country Radio Seminar in Nashville on Wednesday (Feb. 15). Underwood will also perform during halftime at the 2006 NBA All-Star Game in Houston on Sunday (Feb. 19). The game will air on TNT at 8 p.m. ET. She performed the national anthem during game 4 of the NBA finals last summer.