Chris Brown was so paranoid about keeping his attendance at Rihanna’s birthday party a big fat secret — he actually tried to FORCE partygoers to sign confidentiality agreements … TMZ has learned.
Sources tell us, Chris refused to enter the private party Monday night at the famous Hearst Mansion in Beverly Hills until everyone signed an NDA — sending his henchmen in beforehand to gather every partygoer’s signature.
We’re told although they didn’t get EVERYONE to sign — Chris eventually walked in … and spent a huge chunk of the night nuzzling up against Rihanna.
According to sources, the two got real intimate — sitting next to each other, talking, and holding hands … all perfectly legal ever since the restraining order was lifted.
As for the rest of the party — we’re told it was jam-packed with celebs including Katy Perry, Bruno Mars, and Chris Martin (no Gwyneth).
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