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"&lt;strong&gt;&lt;img alt=\"Chris Brown and Rihanna\" src=\"http://ll-media.tmz.com/2012/02/16/0216-rihanna-brown-exd.jpg\" /&gt;&lt;br /&gt;Chris Brown&lt;/strong&gt; was so paranoid about keeping his attendance at &lt;strong&gt;Rihanna&lt;/strong&gt;'s birthday party a big fat secret -- he actually tried to FORCE partygoers to sign confidentiality agreements ... TMZ has learned.&lt;br /&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;According to sources, the two got real intimate -- sitting next to each other, talking, and holding hands ... all perfectly legal ever since &lt;a href=\"http://www.tmz.com/2011/02/22/chris-brown-rihanna-protective-order-do-not-annoy-beating-domestic-violence-probation-fight-court/\"&gt;&lt;strong&gt;the restraining order was lifted&lt;/strong&gt;&lt;/a&gt;.&lt;br /&gt;&lt;br /&gt;As for the rest of the party -- we're told it was jam-packed with celebs including &lt;strong&gt;Katy Perry&lt;/strong&gt;, &lt;strong&gt;Bruno Mars&lt;/strong&gt;, and &lt;strong&gt;Chris Martin&lt;/strong&gt; (no Gwyneth).&lt;br /&gt;&lt;br /&gt;Rihanna's cake was pretty badass too -- a giant spliff ... with a small Rihanna made out of icing, riding it like a horse.&lt;br /&gt;&lt;br /&gt;&lt;img alt=\"Rihanna birthday cake -- her riding a huge marijuana joint\" src=\"http://ll-media.tmz.com/2012/02/16/0216-rihanna-cake-sub.jpg\" /&gt;&lt;br /&gt;&lt;a href=\"http://www.tmz.com/2012/01/25/miley-cyrus-penis-cake-photos/\"&gt;&lt;strong&gt;Eat your heart out, Miley.&lt;/strong&gt;&lt;/a&gt;&lt;br /&gt;&lt;br /&gt;&lt;img alt=\"update_bar\" src=\"http://ll-media.tmz.com/2011/08/09/update-bar.jpg\" /&gt;&lt;br /&gt;Chris' rep tells TMZ, confidentiality agreements were distributed only to workers at the party and anyone who was caught videotaping/snapping a pic of CB.&lt;br /&gt;&lt;br /&gt;Asking people to sign confidentiality agreements AFTER they've already taken pics -- priceless.&lt;br /&gt;&lt;!-- relatedlinks --&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.tmz.com/2012/02/16/chris-brown-rihanna-birthday-confidentiality-agreement/13/>