Lance Armstrong & Girlfriend Welcome Baby Boy

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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.

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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!!"

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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."

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Lance and Sheryl broke off their engagement in 2006.

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