The Arizona Cardinals star and pro soccer player made the announcement Tuesday evening ... saying their baby boy arrived on Oct. 23.
The couple -- who got married in February 2020 -- shared a photo with their bundle of joy in the hospital bed on Instagram.
"Love and happiness have reached heights we never even knew existed," Watt said in the caption.
The couple also revealed their son's name -- Koa James Watt.
The great news had their post swarmed with comments from fans and NFL players .