Songstress Demi Lovato has confessed that while she loves her new eating regime, which mostly consists of raw foods and vegan rules, she had to break that during a very special dinner party that had impressive guests. 

She told Extra that she went to a dinner party held by American film director Robert Rodriguez last month and that he had President Barack Obama as a guest, which meant she had to let her veganism and raw food diet take a back seat as she didn't want to be fussy or cause any problems:

"You kind of can't turn down pizza that Robert Rodriguez handmade - and that you are also eating with the President."

She also recalled her conversation with President Obama from the private event, and explained that he remembered her from a previous meeting and described her as a 'megastar':

"I reminded him that we'd met before. I sang at Christmas in Washington. He said, 'I know who you are. You're a megastar, you think I'm stupid?' I was like, 'No, Mr. President, I'm so sorry, you're not stupid!' Then we did talk about his daughters and [his wife] Michelle, and he was like, 'You just scored me cool points,' and I said, 'You scored me cool points! Thanks for calling me a megastar.'"

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Watch Lovato's latest music video below: