On Thursday, Michael Phelps and his fiancée Nicole Johnson welcomed their son Boomer Robert. The couple announced their pregnancy last November. Over the weekend, Phelps posted a shirtless pic with him, Nicole, and the little boomer of joy. The new dad does not (yet) have a dad bod, but very much still a swimmer bod. He always goes shirtless for a good reason, like getting some skin-to-skin time with his newborn:

Sources: Instagram: Michael Phelps