Universal Pictures subsequently cast him as the lead in Apatow 's films Knocked Up and Funny People .
Rogen was cast in a supporting role and credited as a co-producer in Apatow 's directorial debut , The 40 - Year - Old Virgin .
Universal Pictures subsequently cast Rogen as the lead in Apatow 's films Knocked Up and Funny People .
Rogen was cast in a supporting role and credited as a co-producer in Apatow 's directorial debut , The 40 - Year - Old Virgin .