Television actress Shahnaz Rizwan, who entertained fans as Toshi Bhalla in Ekta Kapoor's popular show Yeh Hai Mohabbatein,And the actress who will be stepping in her shoes has already started shooting as well. Veteran actress Usha Rana will be playing the role of Karan Patel's mother. Usha has featured in quite a few films, TV shows and done a lot of theatre shows in the past.Pakistani origin actress Shahnaz, had given a prior two months notice to the makers. And her reason for leaving the show is quite genuine.She has been living away from her family from last three years and wants to go back to them. They live in London.Shahnaz has been a part of Yeh Hai Mohabbatein for more than five year and tickled the funny bone with her crazy antics. She will be remembered as Ishita's mother in law, who loved to get high on alcohol and enjoyed irritating and competing with her madrasi padosan aka Ishita's mother.