Tyler Hubbard and wife Hayley, who tied the knot in July 2015, welcomed their first child, daughter Olivia Rose, in December 2017

It’s “Simple” — Tyler Hubbard has another baby on the way!

The Florida Georgia Line musician and wife Hayley are expecting their second child in late summer, their rep confirms to PEOPLE exclusively.

The couple revealed the happy news at Clive Davis and the Recording Academy’s annual pre-Grammy gala on Saturday night, with Tyler sweetly kissing his wife’s bump on the red carpet.

“The Hubbard family is growing,” he captioned a photo of the sweet moment on his Instagram account Sunday. “We are excited to share that little nugget #2 is on the way. We are so thankful and can’t wait to see Olivia be a big sister. What do y’all think…. boy or girl?”

Added Hayley, “Thrilled to finally share that Olivia will be a big sister in August! We couldn’t be more excited and grateful!!!!”

Tyler Hubbard and wife Hayley
| Credit: Axelle/Bauer-Griffin/FilmMagic/Getty Images
Tyler and Hayley Hubbard
| Credit: Axelle/Bauer-Griffin/FilmMagic
Pre-GRAMMY Gala and GRAMMY Salute to Industry Icons Honoring Clarence Avant - Arrivals
Brittney and Brian Kelley; Tyler and Hayley Hubbard
| Credit: Getty

Florida Georgia Line is nominated at Sunday’s show in the best country duo/group performance category for “Meant to Be,” their smash collaboration with Bebe Rexha, which they performed at Saturday’s event.

Brian Kelley, Bebe Rexha and Tyler Hubbard
| Credit: Frazer Harrison/Getty Images

The spouses’ exciting baby news comes almost 14 months after they welcomed their first child: daughter Olivia Rose, who was born in December 2017. The baby girl made the big announcement in an adorable photo shared with PEOPLE: “Only child expiring August 19, 2019! I’m going to be a big sister!” read a sign perched next to a smiling Olivia.

Tyler and Hayley Hubbard’s daughter Olivia Rose sharing the news
| Credit: Courtesy Tyler and Hayley Hubbard

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Hubbard, 32, and Hayley married back in July 2015 following a nine-month engagement — and the second-time mom-to-be’s first pregnancy was anything but boring.

The “This Is How We Roll” singer and his wife revealed that they were having a boy in June 2017 during a Dirt Bikes or Diamonds party, but were thrown a curve ball when they found out they were actually expecting a daughter.

“Gods got jokes … After thinking we are having a boy for the last few months, turns out the blood test was wrong and we’re actually having a little girl,” Hubbard explained on Instagram in August of that year. ” … So many emotions but really excited about this next chapter … ”

RELATED VIDEO: Florida Georgia Line’s Tyler Hubbard and Wife Hayley Welcome Daughter Olivia Rose

Tyler, Olivia and Hayley Hubbard
| Credit: Katie Kauss for CMA

The Grammy-nominated artist opened up to PEOPLE following Olivia’s birth about how much he admired his wife’s demeanor during labor and delivery.

“I think it’s something that God doesn’t let men do for a reason — I don’t know if we could get through it,” Hubbard admitted of childbirth with a laugh, adding that he “100 percent” had a new respect for both Hayley “and all women who have babies.”

Continued the new dad, “It’s a beautiful thing, and Hayley was really strong and calm and relaxed. I couldn’t have been more proud of her the whole time.”