That Is One Lucky Baby

Giuliana and Bill Rancic celebrated St. Patrick’s Day the right way — by posting an adorable photo of their son, Edward Duke.

“Happy St. Patrick’s Day from Baby O’Duke #25percentirish,” Bill, 41, tweeted to his thousands of followers on Sunday, with a picture of Duke sporting an adorable green mustache attached.

Duke, of course, was smiling his little cheeks off. Their struggle to conceive was well documented on their reality series, Giuliana and Bill.

The couple welcomed Duke last August via a surrogate.

Bill — who married Giuliana in 2007 — often shares photos of his son on Twitter, including this equally adorable snap from December.

The Rancics were last seen in Hawaii enjoying their family vacation in a nearby pool.