It girlˈIt girl noun [countable] 
a fashionable and attractive young woman, especially one from a rich upper-class family, who is well-known because she goes to a lot of fashionable events that people read about in newspapers and magazines
a fashionable and attractive young woman, especially one from a rich upper-class family, who is well-known because she goes to a lot of fashionable events that people read about in newspapers and magazines