London: 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.
Ahead of the event, Bieber excitedly wrote on Twitter "big night ahead" though few hours after turning 19 he dejectedly tweeted, "Worst birthday".
The teen popstar and his friends left the club after the altercation with Bieber heading straight back to his hotel afterward, reported E! Online.
Bieber held a circus-themed birthday bash at London`s Cirque du Soir with guests including British singer Ella-Paige Roberts Clarke.
Twitter, meanwhile, is abuzz with disappointed fans using the hashtag #BeliebersHatePaparazzi and blaming the usual suspects for ruining the Biebers` big night (sic).