Demi Lovato tweeted a throwback photo of fellow X Factor judge Simon Cowell and he looks entirely different.

Posted on Wednesday, the photo shows a thinner Cowell with long hair and a even mustache.

Seemingly shocked by the photo, Lovato wrote the caption, "I can't. Um. Care to explain @SimonCowell?"

Cowell took to Twitter to respond to the 20-year-old's taunts.

"Demi. Stop please with the horrific pictures. They are giving me nightmares," he wrote.

Following that tweet he added, "I thought X Factor would be fun this year with me and three girls on the panel. Be careful what you wish for."

On May 29, Lovato also uploaded another old photo of the judge on her Twitter page and in this one he was seen wearing suspenders.

"Well, well. Look at this ancient pic I found. Same t-shirt, same middle part. Recognize this @SimonCowell?," she wrote.

These aren't the only times the 20-year-old and Cowell have picked on each other. Their taunting started in season 2 when Lovato first appeard on the show as a judge.

"I get the privilege of being paid to mess with my boss all day," she said during her appearance on Jimmy Kimmel Live in 2012.

Lovato, Cowell, along with the two other judges, Kelly Rowland and Paulina Rubio have been in New Orleans filming the X Factor auditions for season 3. See photos of the stars at those auditions here.

It seems this season will also have some unpredictable and comical performances. One man performed in a chicken suit during the Louisiana auditions, Cowell wrote on Twitter. Before heading to New Orleans, the judges filmed the auditions in Charleston, S.C. in May and according to Cowell those weren't any better.

"We've seen some really good people outnumbered, however, by some of the worst auditions, genuinely, that I have ever heard in my life," Cowell said during a press interview in May.

The new season of X Factor will premiere this fall.

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Demi Lovato, Simon Cowell, X factor usa