Cameron Diaz , 53, has welcomed her third baby with husband Benji Madden, 47, the Good Charlotte rocker announced Monday. “Cameron and I are Happy, Excited, and feeling so BLESSED to announce the birth of our third Child, Nautas Madden,” Benji shared on Instagram alongside an image of a ship — a nod to his son’s nautical name. “Welcome to the world Son!!” In the comments section, Diaz herself replied with five heart emojis. Benji’s post also included a meaning behind the name Nautas, which read: “Sailor, navigator, voyager. One who embarks on a journey and fears not the unknown.” Cameron Diaz and Benji Madden have welcomed their third child together: Nautas Madden (Getty) The famous couple married in 2015 and have kept their children out of the spotlight (Getty) Diaz and Madden, who married in 2015, are already parents to daughter Raddix, six, and son Cardinal, two. The famously private pair have largely kept their family life out of the spotlight, only occasionally sharing updates with fans.…