Mathew Horne: Mathew Horne. Actor: Planet 51. Mathew Horne was born on 6 September 1978 in Nottingham, England, UK. He is an actor and writer, known for Planet 51 (2009), The Nan Movie (2022) and Agatha Raisin (2014). He has been married to Celina Bassili since October 2021.