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.
"Lucia Rose, Carina Rose, and Isabetta Rose are beyond excited to welcome their new sister Adelina Rose!" he wrote of the photo, which is seriously killing us with cuteness.
The 38-year-old proud papa announced that he and his wife were expecting on New Year's Eve, tweeting a sonogram photo along with the caption, "My wife Amber is so hot, I can't keep my hands off her... Here is to 2014!!! #4."
The loved-up couple met when both former Survivor contestants (Amber from Australian Outback and Boston Rob from Marquesas) returned to compete on Survivors: All-Stars in 2003.
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During the show's live finale, Amber was declared the winner of the $1 million prize and scored herself a fiancé to boot after Rob dropped to his knee and proposed.
The reality twosome, fondly known as "Romber," tied the knot in April 2005 at the Atlantis resort at Paradise Island in the Bahamas.
In addition to Survivor, they also competed on The Amazing Race.
Congrats to the happy family!