Rumors have been flying and fans have been eagerly anticipating the show-stopping “Grand Opening” and “Grand Closing” of BET Awards ’06, as each year proves to be more extraordinary than before. This year, the BET Awards show begins with a Grand Opening salvo by America’s favorite new Dreamgirl Beyonce, and the world premiere television performance of her new smash “Deja Vu.” To cap the show, BET Awards ’06 has the legendary Prince bringing it home with the Grand Closingto this annual tribute to music, movies, sports and more with an out-of-this-world performance. Prince’s song selection is a closely guarded secret … even to the show producers at this point…