No.4 stands for unconventionality.

In Bollywood Few Actors Who Are Unconventional They are no.4.
In Hollywood almost all unconventional actors are no.4.
Today Paoli Dam made her unconventional debut in bollywood in Hate Story.She is no.4(4 oct.)
Preity Zinta is no.4(31st jan.)
Tabu is no.4(4 nov.)
Kishore Kumar is no.4(4 aug.)
Urmila is no.4(4 feb.).
They all are unconventional actors & have peculiar qualities of no.4.