June 24, 2014 12:45 PM

Courtesy Rob Mariano

Four for four!

Rob and Amber Mariano welcomed their fourth daughter, Adelina Rose, early Friday morning in Florida, the reality stars announced via Twitter.

“We are thrilled to announce [the birth of] Adelina Rose Mariano 12:51 a.m. June 20th, 2014,” Rob, 38, wrote, sharing a photo of himself and his wife, 35, with their newborn.

“Mom and baby are doing great!” Adelina joins big sisters Lucia Rose, 4½, Carina Rose, 3½, and Isabetta Rose, 2, at home.

“[The girls] are beyond excited to welcome their new sister,” Rob captioned a second photo of all four of his daughters.

The couple, who announced the pregnancy on New Year’s Eve, competed on Survivor and The Amazing Race before wedding in the Bahamas in 2005.

“I’m definitely outnumbered now,” Rob, who won Survivor on his fourth try in 2011, previously told PEOPLE. “But at the end of the day, it’s exciting and fun.”

Lucia Rose, Carina Rose, and Isabetta Rose are beyond excited to welcome their new sister Adelina Rose! pic.twitter.com/kSFm6N9Lj6

— Boston Rob (@BostonRob) June 20, 2014

— Sarah Michaud

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