"Diva" isn't always a bad thing, and VH1 knows that: That's why big-time celebs like Katy Perry, Nicki Minaj, Keri Hilson and other big acts are representing on VH1's Divas Salute the Troops. The tribute show aimed at showing some love for the country's servicemen and women will air on Sunday evening (9pm EST), and below is a sneak peek video of Perry, Hilson Minaj and Sugarland singer Jennifer Nettles belting out the show's opening number, "Boogie Woogie Bugle Boy." Naturally, the A-listers honored the troops by dressing up in khaki fatigues and hats. The show was taped on a military base.....