Justin Bieber made his guests sign a confidentiality agreement prior to entering a party over the weekend.
The 19-year-old singer organised an extravagant bash for around 100 friends but only allowed them to enter on the condition they signed a binding contract, which if broke would result in them paying $3 million directly to him.
According to TMZ - who obtained a copy of the agreement - guests and workers were prohibited from making posts on Twitter or Facebook, texting or using phones during the event or discussing in any way what went on behind the closed doors of his Calabasas mansion in Los Angeles County, California, on Friday night.
The document stipulated that anyone breaking the rules was liable to pay up the hefty sum with no exceptions, although Justin has reduced the fee from $5 million to $3 million according to a contract found for one of his previous parties.
However, it didn't take long for the 'Boyfriend' hitmaker to ignore his own strict rules about the party - which landed him in trouble with the police after neighbours complained about the noise
As he got into his car on Saturday, he told a video paparazzo the opulent event was reminiscent of a scene from Leonardo DiCarprio's film 'The Great Gatsby', in which he plays wealthy party lover Jay Gatsby.
Justin said: "It was wild. It was some Great Gatsby s**t, man."