LOS ANGELES, Feb 13 (Reuters) - Actor, writer and comedian Steve Martin has become a dad for the first time at age 67 - and managed to keep it secret from the media for more than a month. Martin and his second wife, Anne Stringfield, 41, "are new parents and recently welcomed a child," a spokeswoman for the actor said on Wednesday. The spokeswoman gave no details, including the sex of the child or the date of birth. But the New York Post cited unidentified sources as saying the baby arrived in December.