Rihanna accused of acting like a diva over charity shoot

RIHANNA has been accused of acting like a diva after she shot a charity public service announcement for UNICEF, but then caused costly re-editing delays after complaining that she looked heavier than usual in the online video clip.The svelte songstress participated in UNICEF's Celebrity Tap campaign, which asks stars to donate bottles of their own tap water to raise money and awareness for