By peoplestaff225
Updated November 09, 2008 08:00 PM
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Fred Hayes/Wireimage

Since welcoming his first son in August, the purpose of life for Mexican actor Diego Luna has become very straight-forward. Out promoting his new movie Milk, Diego — who says "everything is easier now" — tells PEOPLE that as a new father to his baby boy Jerónimo, 11 weeks, his responsibility to provide for his child is "as simple as that." Sharing that there is "just one reason for you to be here," the Y tu mamá también star cites his role as making "sure someone else is happy, and [he] has everything he needs."

While his acting career may have been once been his first priority, becoming a father has put everything into perspective for the 28-year-old, who is "happy" that his child is "the only guy who is not judging me now." Clearly elated over entering into the world of fatherhood, Diego reveals that he has willingly fallen victim to "a different kind of love that you didn’t know existed."

Jerónimo is Diego’s son with his wife, actress Camila Sodi, who has been laying low "taking care of the baby."

Diego’s latest film — Milk — is in theaters December 5th.

Source: PEOPLE