February 2, 2012
ABC Family announced today that The Secret Life of the American Teenager has been renewed for a fifth season. Today's pickup marks a new milestone for a show on the network - it will be ABC Family's first series to hit to 100 episode mark.
The show is currently in the middle of its fourth season, which will resume with new episodes on Monday, March 26, 2012. No premiere date for Season 5 has been announced as of yet.
UPDATE: The final season will premiere on Monday, March 18, 2013
(Source: TV by the Numbers)