The American actor-comedian and one of the cast members of Saturday Night Live, Bill Hader is unimpressed with the Canadian singer-songwriter Justin Bieber's stint on the show and tags the singer as the worst guest host ever.

Bill Hader was known for his lead voice role in Cloudy with a Chance of Meatballs and his supporting roles in comedy films such as Superbad, Adventureland, Forgetting Sarah Marshall and Night at the Museum: Battle of the Smithsonian.

Justin Bieber was made famous by his songs Baby, Never Say Never, One Time and One Less Lonely Girl, just to name a few after being discovered by his current manager, Scooter Braun through his You Tube videos in 2007.

However, the current hot topic on social media today is about the calling of Bill Hader to Justin Bieber as one of the worst "SNL" hosts ever. Bill Hader was with the show for eight whole seasons so he tagging Justin Bieber as worst host seemed to be not a joke.

So what made Bill Hader call Justin Bieber as the worst host? And do "SNL" followers agree with Bill Hader?

In the new book written by authors James Andrew Miller and Tom Shales entitled, Live From New York: An Uncensored History Of Saturday Night Live which goes behind-the-scenes with some of the show's favorite cast members to get the grime wherever they can about whomever they can. Unfortunately, Justin Bieber's grime seems to be of an unpleasant variety, being reckoned by many as one of the worst guest hosts ever because of a horrid attitude.

The former SNL cast member Bill Hader said that he didn't enjoy having Justin Bieber around and the singer is the only one who lived up to his reputation. Fellow SNL cast member Kate McKinnon also revealed that Justin Bieber wasn't too upset but also exactly not thrilled with her now famous impression of him.

However, even if Justin Bieber was allegedly hard to work with, some said that his infamous SNL stint was fabulously entertaining.

While this is not the first time that Bill Hader belittled Justin Bieber, last May he also expressed his dislike with the singer through the former's interview with Howard Stern dissing about Justin Bieber's diva antics.

Though Beliebers are bound to take a stance against this undesirable talk, it's indeed unfortunate that Justin Bieber left this bad aura behind him, particularly at such an iconic show as SNL.

Bill Hader is certainly an unBelieber as he belittles Justin Bieber's stint on SNL and tagging him as the worst guest host ever.