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Kim may not be comfortable enough to talk marriage with new beau Miles Austin just yet -- but she IS comfortable enough to take him to a party at the Playboy Mansion!

With all those scantily clad Bunnies running around, that shows real trust and commitment!

But before the party, the lovebirds went to a romantic dinner at Crustacean in Beverly Hills. Wearing a sexy, low cut royal blue top, we have no doubt that Miles couldn't take his eyes off her all night!