Mayim Bialik is best-known for playing Blossom Russo back in the 90's but now her recurring role as Amy Farrah Fowler on CBS's The Big Bang Theory has been upped to a regular role as she continues as Sheldon's friend who is a girl but not his girlfriend.
In spoiler news, Mayim says that her character will start to develop feelings for someone else probably leading to something more happening between her and Sheldon ...