Justin Bieber tweets `Worst Birthday` after fight with club security

Teen pop star Justin Bieber`s 19th birthday party celebrations endly on a sour note after he and his entourage reportedly had a confrontation with the security people of the club where they were partying.

`Shirtless` Justin Bieber celebrates b`day, parties away until 6 am

Justin Bieber, who has habitually been putting his abs and growing tattoo collection on display via social networking sites, was seen showing up shirtless at his London hotel at 3 am on his 19th birthday on Friday.