Cyclist Lance Armstrong welcomed a baby boy! Via Twitter, newborn Max Armstrong “wrote” and posted a photo, “Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!”

Lance’s girlfriend Anna Hansen gave birth to Max on Thursday, June 4th after the pregnancy was announced in December. The baby boy is the fourth child for Lance Armstrong, joining siblings Luke, Isabelle, and Grace from Lance’s previous marriage to Kristin Armstrong.