Conversation so far:
Who was cast as the lead actors of Om Shanti Om?
Shah Rukh was cast as the lead. Padukone was cast as the female lead without a screen test.
Who was cast as the lead actress of Om Shanti Om?
Padukone was cast as the female lead without a screen test.

Question: Who made the casting decisions?
Self-contained rewrite: Who made the casting decisions of Om Shanti Om?