Nicole Kidman and her husband Keith Urban went to see The Merry Widow at Sydney Opera house on Thursday, and the A-list duo were joined by one very special guest – Nicole's beloved mum Janelle!MORE: Nicole Kidman and Keith Urban's home is basically a hotel - see insideThe Eyes Wide Shut star shared a sweet photo of the night out on Instagram, and the trio could be seen sitting in the famous opera house's stalls with masks covering their faces. WATCH: Nicole Kidman's husband Keith Urban smashes