The retired NFL player, 32, welcomed his third baby, daughter Isabella Grace, with his wife Gabriella, announcing the happy news via a joint Instagram post on Thursday, April 24. In the announcement post, the newly minted parents of three shared the first photos of their little one.

One snap showed the little one lying down, wearing a pink onesie with knit toys and a name sign near her. Other pictures featured the newborn with her family in the delivery room, including Derek holding her on a couch as her brothers smiled around her, and another in her mom’s arms as Gabriella and Derek looked lovingly at her.

“Last week we welcomed our sweet little girl, Isabella Grace, into the world!” the proud parents wrote in their captions. “Our hearts are so full and the boys are obsessed with their baby sister! .”

Derek’s brothers, TJ Watt and JJ Watt shared their love for the couple’s new addition. TJ commented a red heart in the comment section, and JJ reposted their announcement post onto his Instagram Story, writing, “Welcome to the World Bella!!! .”

“Here we grow again!” the couple wrote. “We are beyond excited to be adding another little one to our family in April! The boys can’t wait to find out if they’re going to have a baby brother or a baby sister… .”

In a sweet black-and-white snap, the couple’s sons stood behind a wired fence at a baseball field with their backs to the camera, showing baseball jerseys that included their names and birth order. The siblings also rocked baseball hats that are adorned with “Big Bro Club” patches.

Next to the two toddler boys, another jersey hung from the fence, with the words “on deck” stitched on the back and a number 3. A sonogram strip was placed beside the shirt, and a mini baseball bat and glove sat below.

Derek’s big brother JJ shared his excitement for his little brother in the comment section, writing, “LET’S GOOOOOO!!!!!!!!”