Hugh Hefner and Crystal Harris Get Marriage License

Sources tell TMZ, Hef and Harris dropped by the Beverly Hills Courthouse Tuesday morning to obtain the necessary paperwork in order to make their New Year's wedding ceremony official.

TMZ broke the story ... the re-engaged couple are planning to tie the knot during an intimate ceremony on New Year's Eve at the Playboy Mansion.

Harris moved back into the Mansion earlier this year, and we're told she and Hef have been on fantastic terms ever since.