As the US X Factor's auditions are already underway, Demi Lovato had some jokes about her fellow judge.

"Simon's shirt is always open," the singer told Britain's Channel 4's Chatty Man which will air on May 31. "One more [button] and it will be [open to] his belly button. It is getting dangerous."

The 20-year-old didn't stop there.

"I never looked at his chest, his moob area. I am distracted by the bush on his chest."

She also revealed the secret to Cowell's seemingly perfect hair.

"He puts his head forward and then he blow dries it. He does that every time before he goes on," she said. "He always gets the centre parting just right. I have never seen him with a comb trying to get it right. It is just how it falls."

She also joked, "Maybe he uses the same extensions for his hair that he does for his chest."

Hours before her comedic appearance will air on TV, Lovato performed a free concert at the Prochester Hall in London.

Many fans, however, were a bit upset because they weren't one of the 500 to get in, according to BBC.

Wristbands were given out on a first come, first served basis. While her website asked that fans do not sleep at the venue overnight, many did so, and those were the fans who easily received the bands.

"We have had unprecedented demand on free tickets," Vevo said in a statement. "While we know that some fans will be disappointed about not getting a ticket for this intimate show, we'd like to reassure everyone that all of the footage from the gig will be available for free online across all Vevo platforms, allowing Demi's fans worldwide to experience the show."

Fans can also indulge in Lovato's eBook called Demi. Read all about her book here.

Tags
Demi Lovato, X factor usa, Simon Cowell