On their trip, the Hubbard family was joined by Tyler's bandmate, Brian Kelley, and his wife, Brittney, who helped with the reveal.
"Thanks @brittneykelley for keeping the surprise and planning this fun reveal at one of our favorite places in the world!" Hayley captioned her Instagram photos.
ET spoke with Tyler months after he and Hayley welcomed Olivia back in 2017. At the time, Tyler even predicted that they'd have three kids one day.
"I think we're going to end up -- if it's God's plan -- hopefully with three kids," Tyler said.
ET caught up with Tyler again after he and Hayley became a family of four, and he revealed that his daughter had taken to being a big sister very well.
"She's doing great. She wakes up talking about baby Luca and wanting to give him kisses and everything," he said. "Knock on wood, there's been no jealousy and stuff like that yet. She's really adjusting well and loves him a lot."
Watch the video below for more on the Hubbards and Florida Georgia Line.