'This Is 40': Judd Apatow and Paul Rudd on real-life inspiration

"Write what you know," goes the old saw, and filmmaker Judd Apatow has done just that with the new marriage comedy "This Is 40." The film, billed as a "sort-of sequel" to 2007's "Knocked Up," stars Paul Rudd and Leslie Mann (Apatow's real-life wife), as a couple entering their 40s and going through the trials of marriage, parenthood and middle age.

By Oliver Gettell

December 17, 2012