In the midst of slowly becoming one of the most dissed musicians to date, Bill Hader has come forward to add to the mounting negative press against 19-year-old popstar Justin Bieber.

According to E! News, Saturday Night Live's Hader appeared on Howard Stern's talk show where he dished about his favorite Saturday Night Live guest host, Justin Timberlake, and his least favorite, Bieber.

"He's great," Hader said about the “Suit & Tie” singer. "Also, the guy doesn't show up with anybody. It's just him."

On the flip side, however, Hader notes that Bieber has a diva-like personality.

“Justin Bieber showed up with like 20 guys," Hader continued. "He had a guy holding a slice of pizza. A guy holding a Diet Coke. You're trying to fight through all these people to get dressed. Timberlake, it was just him. He's a real class act, that guy."

Hader, who recently announced his departure from the hit skit show, adds to the growing press against Bieber. Over the weekend the “Beauty & the Beat” singer was booed at the Billboard Music Awards as he accepted his award. Bieber demanded respect on stage, only to get booed even louder.