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4 June 2013, 12:05
The US singer-songwriter says she has told the Syco boss a lot of things that the public doesn't even know.
Demi Lovato says she feels she can really open up to fellow The X Factor USA judge Simon Cowell, and has described the music label boss as a "really cool guy".
The 'Heart Attack' singer, who has returned for a second season on the panel of the FOX series, says people's perception of the usually harsh judge don't reflect what he's really like as a person.
"Working with him is really great," Demi told The Sun, about the Syco head honcho. "He's a really, really cool guy, not what people expect, I think.
"He's not as mean as he comes across," the 20 year-old star explained, before revealing the two are "definitely" close.
"I've been able to tell him things I don't tell the public, about my personal experiences, my journey and what I've been through," Demi explained. "He's been really, really cool about everything.
"Way deep down there, he's a good guys," she added.
Check out a picture of Demi Lovato attending a signing event at a HMV below (Credit: PA):
Despite the pair's close friendship Demi did admit that rumours about Simon's vanity and grooming habits are definitely true.
"Definitely! He wears his sunglasses indoors. It's funny, it's a part of who he is," Demi revealed. "He's always blowdrying his hair."
Last week Demi revealed to Capital FM that she is a big fan of UK girl band Little Mix, who's debut album is charting highly in the US since its release.