Cycling star Lance Armstrong, a testicular cancer survivor and Tour de France champ, announced he is the father of a newborn son on Friday.
Armstrong announced via Twitter that Max -- weighing seven pounds and five ounces -- was born overnight.
In a posting on his Twitter page Armstrong displayed a picture with the caption "Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!"
Armstrong announced last December that he and Anna Hansen -- an actress and one-time beauty queen -- were expecting their first child together.
The cycling champ has three children with ex-wife Kristin.
Armstrong, a seven-time Tour de France winner, recently returned to the saddle in a a bid to replicate past Tour de France glories.
He has regularly communicated with fans and journalists alike by posting messages on the Twitter social networking website