Lance Armstrong has announced the birth of his son on the social-networking site Twitter.
Armstrong, who won the Tour de France seven straight years after overcoming testicular cancer, posted a tweet about 11:15 p.m. EDT Thursday welcoming Max Armstrong to the world. He said his son and girlfriend, Anna Hansen, were both fine and attached a picture of the newborn.
Armstrong also has three children with his ex-wife, Kristin.
Three years after retiring following his last Tour de France win, Armstrong announced in September his return to competition and the Tour de France in 2009. He called his comeback an attempt to raise global awareness in his fight against cancer.