By Jeff Jensen
Updated June 06, 2009 at 04:39 AM EDT

Cycling star Lance Armstrong announced the birth of his fourth child, Max, on his Twitter account, according to The Associated Press. “Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!” Armstrong wrote his Twitter followers. The child is Armstrong’s first with girlfriend Anna Hansen. He has three children with his ex-wife, Kristin.