Williams, 40, posted a short video of his wife pushing him down a hospital corridor in a wheelchair, as he cradled their newborn, reported Digital Spy.
"Charlton Valentine Williams has left the building... And daddy is doing just fine," he said.
Williams chronicled the birth of Charlton with pictures and videos and tweeted to say how proud he was of his wife, following a 24-hour labour.
Field previously gave birth to daughter Theodora Rose, nicknamed Teddy, in September 2012.