Friends and family (including Aldean’s daughtersKendyl, 11, andKeeley, 15) gathered atAllenbrooke Farmsin Spring Hill, Tennessee, for a tropical-themed coed party.

“Jason and I both love the beach, so we loved the palm leaves and bright colors,” explains the mom-to-be. “It was beautiful.”

Darling Juliet Photography

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“We created a list and both were throwing names in there throughout the past few months andNavy happened to be the onewe liked the most,” Brittany tells PEOPLE. “I chose Rome because I really wanted to name our son Roman but Jason wasn’t a fan so this was my way of sliding that in there!”

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Copper Whisk Cakesprovided a unique dessert. “Both pregnancies I’ve had a craving for Fruity Pebbles,” says Brittany. “So they made a Fruity Pebble cake!”

Simply Southern Occasionsserved signature mocktails at the bar, while a DJ fromSnyder Entertainmentspun tunes.

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Now, Brittany says she’s looking forward to little Navy’s arrival — and to introducing her to her big brother.

“He doesn’t remotely understandwhat’s going on with my bellyor all the pink things in the house,” she says of Memphis. “I don’t think he’ll have any clue what’s coming.”

“But neither of them will know any different,” Brittany adds. “They’llgrow up together. I can’t wait.”

For Aldean’s growing family, pick up the latest issue ofPEOPLE, on newsstands Friday.

source: people.com