Justin Bieber told his 35 million Twitter followers he had the "worst birthday" ever, after the singer and his entourage clashed with security over their refusal to allow Jaden Smith into Biebs's birthday party at the London club Cirque du Soir on Friday night.

"There was never any mention of Jaden being there, so when he showed up, it caused problems," an inside source told Us Magazine on Saturday.

And what were these problems?

Will Smith's 14-year-old son Jaden was not old enough for the club. When security told Bieber that Smith couldn't attend his birthday party, the singer and his entourage stormed out.

"They could have stayed if Jaden left, but Justin wanted to be loyal to his good friend," The source said.

Justin had seemed upbeat in a tweet earlier in the day on Friday.

"Big night ahead," the "Boyfriend" singer tweeted.

Less than 10 hours later he was dismayed.

"Worst birthday," Justin wrote.

Some of Bieber's Twitter followers weren't very sympathetic.

"You still a millionaire," Twitter user HighSchoolGirlProblems wrote.

And as if that wasn't bad enough for the Biebs, TMZ reported Friday that back in Los Angeles Justin's friend, Dallas Rapper Lil Twist, was pulled over on the 101 Freeway driving the silver Fisker Karma Bieber had lent him.

This is the second time Lil Twist has gotten into trouble with the law for allegedly driving one of Bieber's rented cars.

On January 1, Lil Twist received a ticket while driving Bieber's Ferrari. A 29-year-old photographer was fatally struck attempting to get a photo of the incident.

"While I was not present nor directly involved with this tragic accident, my thoughts and prayers are with the family of the victim," Bieber said in a statement to CNN on January 2. "Hopefully this tragedy will finally inspire meaningful legislation and whatever other necessary steps to protect the lives and safety of celebrities, police officers, innocent public bystanders, and the photographers themselves."

See Justin Bieber's video for the song "Boyfriend" RIGHT HERE: