Baby Navy joins Jason Aldean and wife Brittany's son Memphis, 14 months, plus Aldean's daughters Kendyl, 11, and Keeley, 15, from a previous marriage

Welcome to the Aldean family, Navy Rome!

Jason Aldean and his wife Brittany Kerr Aldean are the proud parents of a baby girl named Navy Rome Williams, whom the couple welcomed on Monday, Feb. 4, the country singer announced on Instagram. Born at 12:45 p.m., Navy weighed in at 7 lbs., 12 oz.

Navy makes six at Aldean and Brittany’s household, which also includes their 14-month-old son Memphis and Aldean’s daughters Kendyl, 11, and Keeley, 15, from a previous marriage.

“Today our family became complete as we welcomed our daughter Navy Rome to the world,” the country star announced on Instagram, sharing a photo of the newborn. “Born on 2/4/19 weighing 7lbs 12oz and looking identical to her older brother. So excited to watch what life has in store for this little princess. 👸🏼”

Added Kerr Aldean, “We welcomed our daughter Navy Rome into the world today at 12:45pm✨ 7lbs 12oz of pure preciousness💕 We love you so much baby girl!!”

Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Parents newsletter.

The 52nd Annual CMA Awards - Arrivals
Jason Aldean and wife Brittany
| Credit: Terry Wyatt/FilmMagic

Aldean, 41, and his wife of nearly four years announced their second baby on the way in July, sharing a photo of Memphis lounging on his side while wearing a “Big Brother” onesie.

“Sup everybody … guess who is gonna be a BIG brother!” the “Burnin’ It Down” crooner captioned the cute snapshot while Brittany, 31, wrote alongside hers, “Here we go again!”

2018 CMT Music Awards - Backstage & Audience
Credit: Jeff Kravitz/FilmMagic

In August, they confirmed they would be welcoming a daughter through a fun sex-reveal video shared to Instagram that showed Kendyl and Keeley swinging at balls that released a pink dust once hit.

The couple celebrated their baby girl with a sweet co-ed shower in November, held at Allenbrooke Farms in Spring Hill, Tennessee. They chose the occasion to share their little one’s name, which was displayed via an adorable neon sign by Shop Narwall.

RELATED VIDEO: Baby Girl on the Way for Jason Aldean and Wife Brittany — Watch the Fun Reveal!

Jason previously told PEOPLE that he and Brittany chose to undergo in vitro fertilization (IVF) again after welcoming the couple’s son Memphis in December 2017.

“After having our son, we knew we wanted to have two kids,” Aldean said. “I have my two older daughters already, so after Memphis was born we knew we wanted to have another one pretty quick — to go ahead and knock it out and have one that was a little closer in age to him.”

In April, Brittany opened up about the year-long journey it took to conceive Memphis, recalling how she had to get an endometriosis diagnosis and, eventually, IVF treatments.

“The IVF was probably harder than the actual pregnancy, for me, because it was just such a roller coaster and so difficult,” the lifestyle blogger and makeup artist said. “It’s such high highs and such low lows, and no one really knows that you’re going through it all so you have to just put on a game face and pretend that you’re not giving yourself shots in your stomach every day, all day.”

In early January, the country singer said he wasn’t too sure about the way Brittany had been preparing their son for imminent big-brother duties — namely, by having him spend time with a doll.

“I’m like, ‘Hold up, time out!’ ” recalled the then-dad-to-be. “Seeing my son playing with a baby doll was kind of odd. Like, shouldn’t he have a truck or something?”

The “You Make It Easy” hitmaker then clarified that he realized his wife was “getting him prepared … to maybe play with the baby” using her technique.

Still, he thought Memphis would be fine without any advance training. “I think he’s going to do great,” Aldean said. Aldean/Instagram
Navy Williams’ nursery
| Credit: Brittany Aldean/Instagram Aldean/Instagram
Navy Williams’ nursery
| Credit: Brittany Aldean/Instagram

On Jan. 25, Brittany showed off the nursery she and Aldean had put the final touches on for little Navy before she completed their family of six.

Standing out among the room’s lavender furniture and accents, the centerpiece was undoubtedly a blue neon “Navy” sign sitting behind the crib — a throwback to the sweet way the couple chose to reveal their daughter’s name at their baby shower late last year.

“I wanted it to be girly but with a little bit of edge. So we did the lavender accents but we also did this accent wall in navy with gold glitter,” Brittany explained of the room, giving her followers a close-up view.