We can only hope that Justin Bieber's 20th birthday goes more smoothly than his 19th one did last week.

Justin tweeted on March 1 that his 19th birthday was his "worst birthday" ever, and now more info is being revealed about Justin throwing a tantrum and a fan getting injured, according to The Sun.

Apparently, the drama started at London restaurant 34, when Justin demanded that another family be moved so his bodyguards could be near him. 

“Justin bowled into the restaurant with an entourage and plenty of attitude,” a source says. “He sat down while the two security lads stood over him, staring at everyone. It was affecting the mood of the room so management politely asked them to sit down."

"[The bodyguards] pointed at the table next to Justin and said they would sit there and to move the people there elsewhere," the source adds. "The management said that wasn’t acceptable so they got up and walked out in a strop. It was ridiculous.” 

Apparently, Justin and his crew then stormed out of the restaurant. Yikes.

Then, Justin and his pals headed to another club, Cirque Du Soir, but as soon as he walked in, mobs of fans swarmed him.

Paparazzi were also clamoring for pics of Bieber, and things apparently got so crazy that a fan was knocked down in the crowd and was injured. 

It now makes sense as to why Justin's birthday wasn't exactly one to remember.

Source: The Sun via Hollywood Life