Demi Lovato and Simon Cowell have a very playful relationship. Case in point: every time they sit at the judge's table on The X Factor, they can't help but poke fun at each other.

When E! News caught up with the native Texan at the Frozen premiere on Tuesday, Nov. 19, in Los Angeles, she couldn't hold back when asked about the 54-year-old.

"I don't know, he's gotten really boring," the 21-year-old blue-haired singer quipped, without missing a beat, while trying to answer whether or not Cowell is stepping up to be a father by selling his bachelor pad.

Sounds just like old times with these two.

After the news broke that Cowell was expecting a baby with his girlfriend Lauren Silverman, Lovato had nothing but teasing love for her pal.

"I don't have any advice to give to someone who has lived like a hundred more years than I have," Lovato exclusively told E! News in August when asked if she's given Cowell tips on how to handle the scrutiny surrounding his personal life. She jokingly continued, "I mean, I might be off by a few, so maybe 110. But I have a lot of fun with him and he's a great guy. He'll be good."

Lovato looked chic as she hit the red carpet, sporting a black dress, black heels and her new bright 'do.

The X Factor judge's song, "Let It Go," is featured on the Disney flick's soundtrack. Lovato also dished about her new music video, "Neon Lights."

"I found a way to make my grown up video," Lovato revealed. "Definitely more sexy and um, more mature but I also stayed covered up which was good, and I danced, and I had blue hair."

To find out how Demi is trying to save Simon from being boring, tune in to E! News Wednesday, Nov. 20, at 7 p.m and 11:30 p.m!

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