Lance Armstrong Becomes a Father Again

06/05/2009 AT 1:50 AM ET

Time to get a child seat for that racing bike.

Lance Armstrong and girlfriend Anna Hansen welcomed a 7 lb., 5 oz, 20-inch-long baby boy named Max, the pro cyclist announced on his Twitter page Thursday night – or, rather, the little guy announced it himself.

“Wassup, world? My name is Max Armstrong and I just arrived. My Mommy is healthy and so am I!” says the post, which includes a photo of the baby in a cap and sticking his tongue out.

In another post, Armstrong includes a photo of the nurse and doctor who helped deliver Max. “They were amazing!!” writes Armstrong.

The seven-time Tour de France winner and cancer survivor, who is making a comeback to pro cycling, announced last December that he and Hansen were expecting their first child together.

He has three children with ex-wife Kristin. The children were conceived through in vitro fertilization with sperm frozen prior to Armstrong undergoing chemotherapy for testicular cancer.

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