Bieber Tweets 'Worst Birthday'

It's Justin Bieber's party and he'll cry if he wants to! The newly 19-year-old heartthrob took to Twitter Friday night to express his disappointment after his birthday plans were reportedly shut down.

Earlier in the night, the excited Girlfriend singer tweeted "big night ahead" and "gonna be a fun night," but mere hours later he was singing a different tune, writing: "Worst birthday." The tweet has been shared 132,565, and has led to #BeliebersHatePaparazzi to start trending. But the photographers may not be to blame this time.

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A source for E! says that Bieber's circus-themed bash at London's Cirque du Soir was cut short after the pop singer's entourage got into an altercation with the club's security.

Bieber reportedly headed straight back to his hotel after the alleged confrontation.