Justin Bieber has spoken out about his birthday fiasco in London on Friday, blaming "overly aggressive dummies" for ruining his big night.

The 19-year-old singer took to Twitter over the weekend to brand the celebration in the U.K. capital his "worst birthday" after he and his entourage were kicked out of the Cirque du Soir nightclub.

Tabloid reports suggested Bieber was thrown out of the venue because he showed up with underage pals, including his rumored new girlfriend, British singer Ella-Paige Roberts Clarke, 17, and actor Will Smith's son Jaden, 14.

However, in a post on Instagram on Sunday, Bieber denied breaking club rules, writing, "The funny moment when people believe I brought underage people to a club... You think Will (Smith) is letting his 14 year old (son Jaden) in a club, I don't think so.

"I love how the club wanted to give the press another reason to why we didn't stay at their weak a** club so they wouldn't look bad for me walking in and right back out."

He adds, "I said 'worst bday' (on Twitter) but that was due to dummies pushing over my fans and being overly aggressive... it wasn't the worst bday (birthday) cuz (because) all my friends from back home flew in... I was just mad in the moment."

In a series of posts on his Twitter page, he then explained, "Sometimes you just wanna vent and not be quiet. I love my fans though. Just gonna chill with friends. London shows this week. It ain't always easy but is what it is. Gonna stay focused."