Rihanna is showing her diva side. The Bajan singer, who appears in a charity public service announcement for UNICEF, has caused a stir with the organization after filming her online advert. According to insiders, the red-haired songstress demanded that the organization re-edit the clip because she was "complaining that she looked heavier than usual."

UNICEF originally reached out to the 'S&M' hit maker to participate in its Celebrity Tap campaign, which sees stars auctioning off bottles of tap water taken from their homes to increase awareness of the global water crisis. After Rih Rih peeped the black-and-white clip, she reportedly asked the editors to re-cut it, delaying the project's launch and costing the organization more than $15,000. However, a spokesperson for UNICEF tells the BoomBox that the U.S. Fund for the organization "did not pay $15,000 for this supposed re-cut nor were we asked to do so."

A UNICEF rep also revealed that nothing of the sort transpired and no further reshoots were done. "We're surprised to hear that," the rep told Page Six. "She was not unhappy. We were very thankful. Rihanna was very collaborative and very participatory. What was shot was what exists now."

The campaign, which has been in existence since 2007, features celebrities including Taylor Swift, Robin Williams, Selena Gomez and more. It has raised $2.5 million since its launch and has helped countries across the world aid their residents.