Karthika Mathew (born Lidiya Jacob), better known mononymously as Karthika, is a Malayali film actress, who has appeared in several Malayalam and Tamil films. She is probably best known for her performances in Nam Naadu and Dindigul Sarathy. She has acted in some advertisements.Lidiya Jacob is born to Malayidamthuruthu Puramadam Veetil P.K Jacob and Alice. She had her primary education from Bethelhem Girls High School, Njaralloor, Kochi. She married her longtime boyfriend Merin Mathew who is a billing officer at Beaumont Hospital in Michigan, US on 18 May 2009. The couple had a son, born on July 2013.Her famous movies are lion,kasi,anyar,shambu and bada dosth etc.