Lance Armstrong Welcomes Baby No. 4

ET can confirm that cycling champ Lance Armstrong is a daddy once more!

The seven-time Tour de France champ tweeted Thursday that his new baby boy, Max, weighs 7 pounds, 5 ounces and is 20 inches long. This is the biker dad's first child with girlfriend Anna Hansen.

"Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!" the proud pop tweeted on his newborn's behalf.