July 29, 2015 08:00 AM

With her second child — a son! — due in September, Jessie James Decker has finally put the finishing touches on her baby boy’s nursery.

And the soon-to-be mom of two has scored a major touchdown with the vintage sleep space, designed by Decker with the help of Joss & Main‘s style director.

“I knew I always wanted a sports-theme room. As soon as I got pregnant with him and knew it was a boy, I just felt like it fit his personality!” Decker, 27, tells PEOPLE.

“I think when people do the animal themes, they are cute and all, but it just didn’t feel like this little guy. He feels like a cool sports dude already.”

Shannon Fontaine/Joss & Main

Any athletic genes passed on to her son wouldn’t come as a surprise: Decker’s husband is New York Jets wide receiver Eric Decker. Already parents to 16-month-old daughter Vivianne Rose, the couple are looking forward to officially being a family of four.

“I think we are most excited about all rolling around on the carpet and just playing together as a family,” shares the country singer and designer. “I can’t wait to see Vivi love on her baby brother and give him kisses.”

Shannon Fontaine/Joss & Main

Although much of the nursery is a far cry from Vivianne’s room — “I won’t be making his room pink or adding tea sets,” Decker jokes — there are a few pieces that have resurfaced.

“I think a necessity is the glider,” she explains. “That comes in handy if they get sad in the middle of the night and miss you and need to be rocked back to sleep.”

Shannon Fontaine/Joss & Main

The big-sister-to-be is already a huge fan of the final product, which includes sweet wall hangings, plenty of storage space and a scoreboard above her brother’s crib.

“She likes to go in his room and play with his little toys I already have out,” shares Decker. “She has pulled in a few of her toys to play with in there, too. She definitely loves his new room.”

Shannon Fontaine/Joss & Main

And now that the nursery has been crossed off the to-do list, Decker is counting down the days until her son’s arrival — and wrapping up a few final loose ends.

“I just need to wash his baby clothes now and put them all away in his closet,” she says. “We are so excited and ready to meet this little guy. It will be an amazing addition to our loving family.”

Shannon Fontaine/Joss & Main

Shannon Fontaine/Joss & Main

— Anya Leon

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