Chris Brown was so paranoid about keeping his recent attendance at Rihanna's birthday party a secret, he tried to legally ensure it, according to reports.
TMZ says Breezy refused to enter the private party Monday at the famous Hearst Mansion in Beverly Hills until everyone signed an non-disclosure pact.
Chris' rep says confidentiality agreements were distributed only to workers at the party and anyone caught videotaping/snapping Chris Brown photos.
Although they didn't get EVERYONE to sign, Chris eventually walked in and spent a huge chunk of the night nuzzling up against former GF Rihanna.
According to sources, the two were quite cozy, sitting next to each other, talking, holding hands ... all perfectly legal with the restraining order lifted.
As for the rest of the party, it was jam-packed with celebs including Katy Perry, Bruno Mars, and Chris Martin (no Gwyneth Paltrow though, sadly).
Rihanna's birthday cake, incidentally? What looks to be giant joint, with a small Rihanna made out of icing, riding that thang like a horse. In a thong. Topless.
Miley Cyrus would be so proud ...