This headline in today's zakzak news, related to actress Miho Kanno getting married.  
>堺雅人&菅野美穂、“大奥婚”! 電撃ゴールイン  

What is the meaning of 大奥婚? I know 大奥 and 婚 by themselves, but not together. I checked Space ALC website, but no results. Google search mostly pointed to this news, and other search engines were no help.