Lance Armstrong & Girlfriend Welcome Baby Boy

Champion cyclist Lance Armstrong smiles for the cameras at the 'We Are Marshall' premiere, 2006 Champion cyclist Lance Armstrong smiles for the cameras at the 'We Are Marshall' premiere, 2006

Lance Armstrong and girlfriend Anna Hansen announced the birth of their baby boy on Twitter Thursday night.

“Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!” a Tweet said on Lance’s Twitter page, which also included a picture of the little guy.

Max weighed in at 7 lb., 5 oz, and measured 20 inches long, according to the cyclist’s Twitter page.

In a later Tweet, Lance wrote, “Kelly our nurse and Dr. Knight. They were amazing!!”

The seven-time Tour de France winner has three previous children with ex-wife Kristin Richards.

As previously reported on Access Hollywood.com, Lance and ex-girlfriend Sheryl Crow’s split over the rocker’s desire to have kids.

“She wanted marriage, she wanted children; and not that I didn’t want that, but I didn’t want that at that time because I had just gotten out of a marriage, I’d just had kids [Luke, Grace and Bella],” Lance says in his July-due biography, “Lance.” “Yet we’re up against her biological clock — that pressure is what cracked it.”

Lance and Sheryl broke off their engagement in 2006.

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