Justin Bieber has thanked his fans for making him smile again after spending what he called his "worst birthday" at a London club.
The star, who turned 19-years-old on Friday, took to Twitter to pay tribute to fans who flooded his page with supportive messages.
Bieber had spent his birthday at the Cirque Du Soir club in London, where it has been reported he was annoyed when several of his friends were not admitted for being under age.
"I see and saw all the posts from around the world. U got me smiling. Love u. Thank u. #beliebers " he wrote on his Twitter page.
The teenage heat-throb also re-tweeted a supportive post from his manager Scooter Braun.
"Life is a roller coaster. Just know when u dip low it is only to build excitement as u will fly high again. Enjoy the journey."
E! Online reports that Bieber and his entourage "got into some kind of confrontation with security" at the club.
A source told the website that some young-looking partygoers were asked for ID when they arrived but were refused entrance due to being underage.
Bieber's friend actor Jaden Smith, 14, was said to be among them, along with the Bieber's rumoured new flame Ella-Paige Roberts Clarke.
"We, like all clubs in London, operate a strict age policy," a club spokesman told the website.
"As a few of the members of the party were under the suitable age of 18, the security team at Cirque Du Soir, London, clearly explained this rule and refused entry to the club for anyone who could not provide us with adequate proof of age."
The singer is reported to have splashed out US$12,000 on the bash, with guests arriving sporting 'Happy Birthday Justin' T-shirts.
"I think Justin and his friends had a good time," an eyewitness told the website "He was, of course, not amused that some of his close friends were refused entrance."
- Cover Media