Rob Mariano is officially outnumbered.
The Survivor alum and his former castmate Amber Mariano welcomed their fourth child—a baby girl—on Friday. The happy couple, who are already parents to daughters, Lucia Rose, 4, Carina Rose, 3, and Isabetta Rose, 2, announced the news via Twitter and revealed their bundle of joys' moniker.
"We are thrilled to announce Adelina Rose Mariano 12:51am June 20th, 2014 Mom and baby are doing great! #4for4," the reality star captioned a precious pic with his wife and newborn daughter in the hospital.
The Survivor Redemption Island winner also shared another pic of his three adorable daughters all marveling over their new sibling while decked out in their "big sister" garb.