The Southern California businessman, who romanced Bachelorette Jillian Harris, also appeared on the Bachelor Pad and dated fellow contestant, Tenley Molzahn, on and off for a few years before settling down and starting a family with girlfriend Samm Murphy.
The proud father shared his love for his new son on Facebook, already calling Koltyn his "mini me."
Locke penned a lengthy but heartwarming note to go with the photo collage. "Little man is just cruising through his first week of life," he wrote. "Hours in my arms or sleeping in my lap and I'm freaking myself out on how long I can just stare at him. So many unknowns in this experience and journey. I'm feeling beyond lucky that he is healthy and loves his Dad and his Mom so much. Can't wait for the adventures ahead."
He also wrote a sweet note to baby Koltyn on Instagram. "Above all else, I promise you love, unconditional love each and every day until I take my last breath," he captioned the pic. "Welcome to the world, son."