The actress has organised a live show to celebrate her dad's career, entitled John Mortimer At The Court... And Later At The Bar, which is set to take place at the Royal Court Theatre on 15 November (09).
It promises to be an emotional night for Mortimer, who was devastated when her father passed away in January (09), as he had always dreamed of writing a play for his talented daughter to star in.
A source tells Britain's Daily Express, "It will obviously be a very emotional night for her as they were so close and she misses him terribly. But she knows this is just the kind of night her father would have loved and that she has to be part of it. He'd expect her to be up there."