"Problem" singer Ariana Grande is hard at work promoting her upcoming album "My Everything," but recent reports claim the 21-year-old is a bit of a diva behind closed doors. According to the Daily News, Grande was reportedly overheard saying that she hopes her fans "all f***king die."

A source close to the singer told the newspaper that Grande recently made an appearance at a New York radio station and played nice in public: she shook fans' hands, signed autographs and smiled for the camera, but once inside she reportedly let a rude comment slip.

"She did autographs and pics and was all smiles until she got into the elevator," the source said. "And as soon as the doors shut she said, 'I hope they all f**king die.'"

Grande has not responded to the rumor, but this isn't the first time she has been accused of diva-like behavior. Last week, reports surfaced claiming that the former "Sam & Cat" actress walked out on a meet-and-greet because she didn't like her outfit and she wasn't happy with the way she was being photographed.

According to the Daily Digest News, Grande and her team demanded that photographers only snap her photo from the left side and journalists were not allowed to ask about Nickelodeon cancelling her show, the recent death of her grandfather, comparisons to Mariah Carey, her rumored collaboration with Justin Bieber (whom she shares a manager with) or her dating life.

Reportedly, sources have said that being around Grande is "like the President is in town," the Daily Digest reports. Grande responded to the rumors during an appearance at an Australian radio station saying that the reports were "ridiculous" and "untrue."

"All these ridiculous untrue things about me, and I'm just like, you know what, that's not real, that's nonsense. My fans know who I am, my family knows who I am, my friends know who I am, and that's all that matters," she said, according to the Daily Mail.

However, E! News' Giuliana Rancic slammed Grande, saying that she has experienced the singer's diva demands. According to the Daily Mail, Rancic recalled a time on the red carpet when Grande allegedly nudged her out the way so the camera could shoot her right side.  

"It was like you either get on the other side or we don't do an interview," Rancic said. "It's one thing if it's Mariah [Carey]. I'll get on any side. I'll bend down. I'll climb a ladder. I'll do whatever it takes. But when you're new on the block, trying to earn your stripes... You gotta do what you gotta do. Try to earn a great reputation, try to go overboard to please people."