30 year old Olympic champion Michael Phelps welcomed his first child with his fiancée Nicole Johnson yesterday. He took to his IG page to announce the arrival of his son, Boomer. He wrote: “Welcome Boomer Robert Phelps into the world!!! Born 5-5-2016 at 7:21 pm !!! Healthy and happy!!! Best feeling I have ever felt in my life!!!”@nicole . m.johnson and Boomer both healthy!!!Check out one of Nicole’s cute pregnancy photo after the cut..